酒井 剛
| 基盤理工学専攻 | 教授 |
| Ⅲ類（理工系） | 教授 |
| 量子科学研究センター | 教授 |
| 宇宙・電磁環境研究センター | 教授 |
研究者情報
経歴
研究活動情報
論文
- Digging Into the Interior of Hot Cores with ALMA (DIHCA). V. Deuterium Fractionation of Methanol
Takeshi Sakai; Nobuhito Shiomura; Patricio Sanhueza; Kenji Furuya; Fernando A. Olguin; Ken'ichi Tatematsu; Yuri Aikawa; Kotomi Taniguchi; Huei-Ru Vivien Chen; Kaho Morii; Fumitaka Nakamura; Shanghuo Li; Xing Lu; Qizhou Zhang; Tomoya Hirota; Kousuke Ishihara; Hongda Ke; Nami Sakai; Satoshi Yamamoto
The Astrophysical Journal, 983巻, 1号, 出版日 2025年04月10日, 査読付
研究論文（学術雑誌）, 英語 - FAUST XXIII. SiO outflow in the protobinary system L483
T. Hirota; B. Lefloch; Y. Oya; M. Bouvier; S. Charnley; I. Jiménez-Serra; A. López-Sepulcre; A. Miotello; J. Ospina-Zamudio; C. Vastel; S. Viti; C. J. Chandler; B. Svoboda; C. Ceccarelli; C. Codella; N. Sakai; Y. Aikawa; N. Balucani; E. Bianchi; P. Caselli; E. Caux; N. Cuello; M. De Simone; F. Dulieu; L. Evans; D. Fedele; S. Feng; F. Fontani; T. Hama; T. Hanawa; E. Herbst; A. Isella; D. Johnstone; H. B. Liu; L. Loinard; L. T. Maud; M. J. Maureira; F. Menard; G. Moellenbrock; H. Nomura; Y. Oba; S. Ohashi; Y. Okoda; J. Pineda; L. Podio; A. Rimola; G. Sabatini; T. Sakai; D. Segura-Cox; Y. Shirley; L. Testi; N. Watanabe; Y. Watanabe; Y. Zhang; S. Yamamoto
Astronomy & Astrophysics, EDP Sciences, 695巻, 掲載ページ A278-A278, 出版日 2025年03月27日, Context. While protostellar outflows are important in terms of mass accretion and angular momentum transport in star formation processes, high-resolution observations of outflows in protobinary systems are still sparse.
Aims. We aim to reveal outflow structures traced by millimeter SiO emission in a low-mass protobinary system, L483.
Methods. We observed the SiO (J = 5−4) line in L483 with the Atacama Large Millimeter/submillimeter Array (ALMA) as part of the large program FAUST (Fifty AU STudy of the chemistry in the disk/envelope systems of Solar-like protostars). The spatial and spectral resolutions were 0.39′′×0.30′′ (780 au×60 au) and 122 kHz (0.17 km s−1 at 217 GHz), respectively. The spectral lines of SO, CS, and C18O were also used to study the physical and dynamical properties of the SiO emitting regions.
Results. Two SiO emission peaks are identified in the central part of L483, which have offsets of 100 au and 200 au toward the northeast (SiO-peak) and north (SiO-N), respectively, from the continuum peak. The SiO-peak shows only blueshifted emission with a broad linewidth of 5 km s−1, while that of SiO-N corresponds to the systemic velocity. Furthermore, weak and compact SiO emission components are distributed up to 2400 au away from the continuum position. They have narrow linewidths of ∼1 km s−1. One of these components is a blueshifted isolated emission feature, 2400 au northeast of the continuum peak, NE-cloud, located outside the east-west outflow lobes. The SiO abundances relative to H2 are 10−10−10−9 and 10−10 in the central part and more widely distributed components, respectively. These are intermediate values between those of strongly shocked regions caused by high-velocity outflows and quiescent molecular clouds.
Conclusions. The central SiO emission could be interpreted as either two different outflows driven by both protostars or as an outflow ejected from one of the circumstellar disks in the binary system. The NE-cloud region is most likely explained as a remnant of an old shock produced by past outflow activity, as has been proposed for the low-mass protostar IRAS 15398–3359. The complex structures of the outflows traced by the SiO line could reflect dynamical processes of the newly formed protobinary system in L483.
研究論文（学術雑誌） - Evidence for Jet/Outflow Shocks Heating the Environment around the Class I Protostellar Source Elias 29: FAUST XXI
Yoko Oya; Eri Saiga; Anna Miotello; Maria Koutoulaki; Doug Johnstone; Cecilia Ceccarelli; Claire J. Chandler; Claudio Codella; Nami Sakai; Eleonora Bianchi; Mathilde Bouvier; Steven Charnley; Nicolas Cuello; Marta De Simone; Logan Francis; Tomoyuki Hanawa; Izaskun Jiménez-Serra; Laurent Loinard; Francois Menard; Giovanni Sabatini; Charlotte Vastel; Ziwei Zhang; Yuri Aikawa; Felipe O. Alves; Nadia Balucani; Gemma Busquet; Paola Caselli; Emmanuel Caux; Spandan Choudhury; Francois Dulieu; Aurora Durán; Lucy Evans; Davide Fedele; Siyi Feng; Francesco Fontani; Tetsuya Hama; Eric Herbst; Shingo Hirano; Tomoya Hirota; Andrea Isella; Claudine Kahane; Bertrand Lefloch; Romane Le Gal; Hauyu Baobab Liu; Ana López-Sepulcre; Luke T. Maud; María José Maureira; Seyma Mercimek; George Moellenbrock; Shoji Mori; Hideko Nomura; Yasuhiro Oba; Ross O’Donoghue; Satoshi Ohashi; Yuki Okoda; Juan Ospina-Zamudio; Jaime Pineda; Linda Podio; Albert Rimola; Takeshi Sakai; Dominique Segura-Cox; Yancy Shirley; Brian Svoboda; Leonardo Testi; Serena Viti; Naoki Watanabe; Yoshimasa Watanabe; Yichen Zhang; Satoshi Yamamoto
The Astrophysical Journal, American Astronomical Society, 980巻, 2号, 掲載ページ 263-263, 出版日 2025年02月20日, Abstract
We have observed the late Class I protostellar source Elias 29 at a spatial resolution of 70 au with the Atacama Large Millimeter/submillimeter Array as part of the FAUST Large Program. We focus on the line emission of SO, while that of 34SO, C18O, CS, SiO, H13CO+, and DCO+ are used supplementarily. The spatial distribution of the SO rotational temperature (T rot(SO)) is evaluated by using the intensity ratio of its two rotational excitation lines. Besides in the vicinity of the protostar, two hot spots are found at a distance of 500 au from the protostar; T rot(SO) locally rises to 53 K at the interaction point of the outflow and the southern ridge, and 72 K within the southeastern outflow probably due to a jet-driven bow shock. However, the SiO emission is not detected at these hot spots. It is likely that active gas accretion through the disk-like structure and onto the protostar still continues even at this evolved protostellar stage, at least sporadically, considering the outflow/jet activities and the possible infall motion previously reported. Interestingly, T rot(SO) is as high as 20–30 K even within the quiescent part of the southern ridge apart from the protostar by 500–1000 au without clear kinematic indication of current outflow/jet interactions. Such a warm condition is also supported by the low deuterium fractionation ratio of HCO+ estimated by using the H13CO+ and DCO+ lines. The B-type star HD147889 ∼0.5 pc away from Elias 29, previously suggested as a heating source for this region, is likely responsible for the warm condition of Elias 29.
研究論文（学術雑誌） - Laboratory Measurement of CH3 17OH Transitions in the Frequency Range from 216 to 264 GHz for Astronomical Application
Akemi Tamanai; Takahiro Oyama; Yoshimasa Watanabe; Takeshi Sakai; Riouhei Nakatani; Shaoshan Zeng; Isabelle Kleiner; Nami Sakai
The Astrophysical Journal, American Astronomical Society, 980巻, 1号, 掲載ページ 110-110, 出版日 2025年02月06日, Abstract
Methanol is one of the most abundant complex organic molecules in interstellar environments. Molecular lines of its rare isotopologues 12CH3 17OH and 12CH3 18OH therefore play a crucial role in examining the column density of 12CH3 16OH, which serves as a reference for organic molecular chemistry in interstellar clouds. In this study, we have recorded the spectroscopic emission spectrum of 12CH3 17OH in the frequency range between 216 and 264 GHz by making use of an emission-type millimeter and submillimeter spectrometer. We have specifically paid attention to the Q-branch transitions, which are the strongest line series in this frequency region. Among the stable oxygen isotopes, 16O, 17O, and 18O of methanol, only 12CH3 17OH obviously shows line profiles having double and/or triple peaks in low-J transitions, due to the nuclear quadrupole interaction. The newly obtained 12CH3 17OH data will play an important role in facilitating a deeper understanding of the organic chemistry related to star and planet formation. The 12CH3 17OH line data allow us to trace and constrain the isotopic ratio 17O/18O in methanol, which is efficient to investigate the galactic-scale evolution of elements. In addition, we also assigned some transitions of 13CH3 17OH in the recorded spectrum.
研究論文（学術雑誌） - Magnetic Fields in Massive Star-forming Regions (MagMaR). V. The Magnetic Field at the Onset of High-mass Star Formation
Patricio Sanhueza; Junhao 峻豪 Liu 刘; Kaho Morii; Josep Miquel Girart; Qizhou Zhang; Ian W. Stephens; James M. Jackson; Paulo C. Cortés; Patrick M. Koch; Claudia J. Cyganowski; Piyali Saha; Henrik Beuther; Suinan 遂楠 Zhang 张; Maria T. Beltrán; Yu Cheng; Fernando A. Olguin; Xing 行 Lu 吕; Spandan Choudhury; Kate Pattle; Manuel Fernández-López; Jihye Hwang; Ji-hyun Kang; Janik Karoly; Adam Ginsburg; A.-Ran Lyo; Kotomi Taniguchi; Wenyu Jiao; Chakali Eswaraiah; Qiu-yi 秋怡 Luo 罗; Jia-Wei Wang; Benoît Commerçon; Shanghuo Li; Fengwei Xu; Huei-Ru Vivien Chen; Luis A. Zapata; Eun Jung Chung; Fumitaka Nakamura; Sandhyarani Panigrahy; Takeshi Sakai
The Astrophysical Journal, American Astronomical Society, 980巻, 1号, 掲載ページ 87-87, 出版日 2025年02月05日, Abstract
A complete understanding of the initial conditions of high-mass star formation and what processes determine multiplicity requires the study of the magnetic field in young massive cores. Using Atacama Large Millimeter/submillimeter Array (ALMA) 250 GHz polarization observations (0 3 = 1000 au) and ALMA 220 GHz high-angular-resolution observations (0 05 = 160 au), we have performed a full energy analysis including the magnetic field at core scales and have assessed what influences the multiplicity inside a massive core previously believed to be in the prestellar phase. With a mass of 31 M ⊙, the G11.92 MM2 core has a young CS molecular outflow with a dynamical timescale of a few thousand years. At high resolution, the MM2 core fragments into a binary system, with a projected separation of 505 au and a binary mass ratio of 1.14. Using the Davis–Chandrasekhar–Fermi method with an angle dispersion function analysis, we estimate in this core a magnetic field strength of 6.2 mG and a mass-to-magnetic-flux ratio of 18. The MM2 core is strongly subvirialized, with a virial parameter of 0.064, including the magnetic field. The high mass-to-magnetic-flux ratio and low virial parameter indicate that this massive core is very likely undergoing runaway collapse, which is in direct contradiction with the core accretion model. The MM2 core is embedded in a filament that has a velocity gradient consistent with infall. In line with clump-fed scenarios, the core can grow in mass at a rate of 1.9–5.6 × 10−4 M ⊙ yr−1. In spite of the magnetic field having only a minor contribution to the total energy budget at core scales (a few thousands of astronomical units), it likely plays a more important role at smaller scales (a few hundreds of astronomical units) by setting the binary properties. Considering energy ratios and a fragmentation criterion at the core scale, the binary system could have been formed by core fragmentation. The binary system properties (projected separation and mass ratio), however, are also consistent with radiation-magnetohydrodynamic simulations with super-Alfvenic or supersonic (or sonic) turbulence that form binaries by disk fragmentation.
研究論文（学術雑誌） - Digging into the Interior of Hot Cores with ALMA (DIHCA). IV. Fragmentation in High-mass Star-forming Clumps
Kousuke Ishihara; Patricio Sanhueza; Fumitaka Nakamura; Masao Saito; Huei-Ru Vivien Chen; Shanghuo Li; Fernando Olguin; Kotomi Taniguchi; Kaho Morii; Xing Lu; Qiu-yi Luo; Takeshi Sakai; Qizhou Zhang
The Astrophysical Journal, American Astronomical Society, 974巻, 1号, 掲載ページ 95-95, 出版日 2024年10月01日, Abstract
Fragmentation contributes to the formation and evolution of stars. Observationally, high-mass stars are known to form multiple-star systems, preferentially in cluster environments. Theoretically, Jeans instability has been suggested to determine characteristic fragmentation scales, and thermal or turbulent motion in the parental gas clump mainly contributes to the instability. To search for such a characteristic fragmentation scale, we have analyzed Atacama Large Millimeter/submillimeter Array (ALMA) 1.33 mm continuum observations toward 30 high-mass star-forming clumps taken by the Digging into the Interior of Hot Cores with ALMA survey. We have identified 573 cores using the dendrogram algorithm and measured the separation of cores by using the Minimum Spanning Tree technique. The core separation corrected by projection effects has a distribution peaked around 5800 au. In order to remove biases produced by different distances and sensitivities, we further smooth the images to a common physical scale and perform completeness tests. Our careful analysis finds a characteristic fragmentation scale of ∼7000 au, comparable to the thermal Jeans length of the clumps. We conclude that thermal Jeans fragmentation plays a dominant role in determining the clump fragmentation in high-mass star-forming regions, without the need to invoke turbulent Jeans fragmentation.
研究論文（学術雑誌） - FAUST-XVII. Super deuteration in the planet-forming system IRS 63 where the streamer strikes the disk
L. Podio; C. Ceccarelli; C. Codella; G. Sabatini; D. Segura-Cox; N. Balucani; A. Rimola; P. Ugliengo; C. J. Chandler; N. Sakai; B. Svoboda; J. Pineda; M. De Simone; E. Bianchi; P. Caselli; A. Isella; Y. Aikawa; M. Bouvier; E. Caux; L. Chahine; S. B. Charnley; N. Cuello; F. Dulieu; L. Evans; D. Fedele; S. Feng; F. Fontani; T. Hama; T. Hanawa; E. Herbst; T. Hirota; I. Jiménez-Serra; D. Johnstone; B. Lefloch; R. Le Gal; L. Loinard; H. Baobab Liu; A. López-Sepulcre; L. T. Maud; M. J. Maureira; F. Menard; A. Miotello; G. Moellenbrock; H. Nomura; Y. Oba; S. Ohashi; Y. Okoda; Y. Oya; T. Sakai; Y. Shirley; L. Testi; C. Vastel; S. Viti; N. Watanabe; Y. Watanabe; Y. Zhang; Z. E. Zhang; S. Yamamoto
Astronomy & Astrophysics, EDP Sciences, 688巻, 掲載ページ L22, 出版日 2024年08月09日, 査読付, Context. Recent observations suggest that planet formation starts early, in protostellar disks of ≤105 yr, which are characterized by strong interactions with the environment, such as through accretion streamers and molecular outflows.
Aims. To investigate the impact of such phenomena on the physical and chemical properties of a disk, it is key to understand what chemistry planets inherit from their natal environment.
Methods. In the context of the ALMA large program Fifty AU Study of the chemistry in the disk/envelope system of solar-like protostars (FAUST), we present observations on scales from ∼1500 au to ∼60 au of H2CO, HDCO, and D2CO toward the young planet-forming disk IRS 63.
Results. The H2CO probes the gas in the disk as well as in a large scale streamer (∼1500 au) impacting onto the southeast disk side. We detected for the first time deuterated formaldehyde, HDCO and D2CO, in a planet-forming disk and HDCO in the streamer that is feeding it. These detections allowed us to estimate the deuterium fractionation of H2CO in the disk: [HDCO]/[H2CO] ∼ 0.1 − 0.3 and [D2CO]/[H2CO] ∼ 0.1. Interestingly, while HDCO follows the H2CO distribution in the disk and in the streamer, the distribution of D2CO is highly asymmetric, with a peak of the emission (and [D]/[H] ratio) in the southeast disk side, where the streamer crashes onto the disk. In addition, D2CO was detected in two spots along the blue- and redshifted outflow. This suggests that (i) in the disk, HDCO formation is dominated by gas-phase reactions in a manner similar to H2CO, while (ii) D2CO is mainly formed on the grain mantles during the prestellar phase and/or in the disk itself and is at present released in the gas phase in the shocks driven by the streamer and the outflow.
Conclusions. These findings testify to the key role of streamers in the buildup of the disk concerning both the final mass available for planet formation and its chemical composition.
研究論文（学術雑誌） - Multiple chemical tracers finally unveil the intricate NGC 1333 IRAS 4A outflow system. FAUST XVI
Layal Chahine; Cecilia Ceccarelli; Marta De Simone; Claire J Chandler; Claudio Codella; Linda Podio; Ana López-Sepulcre; Nami Sakai; Laurent Loinard; Mathilde Bouvier; Paola Caselli; Charlotte Vastel; Eleonora Bianchi; Nicolás Cuello; Francesco Fontani; Doug Johnstone; Giovanni Sabatini; Tomoyuki Hanawa; Ziwei E Zhang; Yuri Aikawa; Gemma Busquet; Emmanuel Caux; Aurore Durán; Eric Herbst; François Ménard; Dominique Segura-Cox; Brian Svodoba; Nadia Balucani; Steven Charnley; François Dulieu; Lucy Evans; Davide Fedele; Siyi Feng; Tetsuya Hama; Tomoya Hirota; Andrea Isella; Izaskun Jímenez-Serra; Bertrand Lefloch; Luke T Maud; María José Maureira; Anna Miotello; George Moellenbrock; Hideko Nomura; Yasuhiro Oba; Satoshi Ohashi; Yuki Okoda; Yoko Oya; Jaime Pineda; Albert Rimola; Takeshi Sakai; Yancy Shirley; Leonardo Testi; Serena Viti; Naoki Watanabe; Yoshimasa Watanabe; Yichen Zhang; Satoshi Yamamoto
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP), 出版日 2024年05月23日, Abstract
The exploration of outflows in protobinary systems presents a challenging yet crucial endeavour, offering valuable insights into the dynamic interplay between protostars and their evolution. In this study, we examine the morphology and dynamics of jets and outflows within the IRAS 4A protobinary system. This analysis is based on ALMA observations of SiO(5–4), H2CO(30, 3–20, 3), and HDCO(41, 4–31, 3) with a spatial resolution of ∼150 au. Leveraging an astrochemical approach involving the use of diverse tracers beyond traditional ones has enabled the identification of novel features and a comprehensive understanding of the broader outflow dynamics. Our analysis reveals the presence of two jets in the redshifted emission, emanating from IRAS 4A1 and IRAS 4A2, respectively. Furthermore, we identify four distinct outflows in the region for the first time, with each protostar, 4A1 and 4A2, contributing to two of them. We characterise the morphology and orientation of each outflow, challenging previous suggestions of bends in their trajectories. The outflow cavities of IRAS 4A1 exhibit extensions of 10″ and 13″ with position angles (PA) of 0○ and -12○, respectively, while those of IRAS 4A2 are more extended, spanning 18″ and 25″ with PAs of 29○ and 26○. We propose that the misalignment of the cavities is due to a jet precession in each protostar, a notion supported by the observation that the more extended cavities of the same source exhibit lower velocities, indicating they may stem from older ejection events.
研究論文（学術雑誌） - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). XI. Statistical Study of Early Fragmentation
Kaho Morii; Patricio Sanhueza; Qizhou Zhang; Fumitaka Nakamura; Shanghuo Li; Giovanni Sabatini; Fernando A. Olguin; Henrik Beuther; Daniel Tafoya; Natsuko Izumi; Ken’ichi Tatematsu; Takeshi Sakai
The Astrophysical Journal, American Astronomical Society, 966巻, 2号, 掲載ページ 171-171, 出版日 2024年05月01日, Abstract
Fragmentation during the early stages of high-mass star formation is crucial for understanding the formation of high-mass clusters. We investigated fragmentation within 39 high-mass star-forming clumps as part of the Atacama Large Millimeter/submillimeter Array Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES) survey. Considering projection effects, we have estimated core separations for 839 cores identified from the continuum emission and found mean values between 0.08 and 0.32 pc within each clump. We find compatibility of the observed core separations and masses with the thermal Jeans length and mass, respectively. We also present subclump structures revealed by the 7 m array continuum emission. Comparison of the Jeans parameters using clump and subclump densities with the separation and masses of gravitationally bound cores suggests that they can be explained by clump fragmentation, implying the simultaneous formation of subclumps and cores within rather than a step-by-step hierarchical fragmentation. The number of cores in each clump positively correlates with the clump surface density and the number expected from the thermal Jeans fragmentation. We also find that the higher the fraction of protostellar cores, the larger the dynamic range of the core mass, implying that the cores are growing in mass as the clump evolves. The ASHES sample exhibits various fragmentation patterns: aligned, scattered, clustered, and subclustered. Using the -parameter, which can help distinguish between centrally condensed and subclustered spatial core distributions, we finally find that in the early evolutionary stages of high-mass star formation, cores tend to follow a subclustered distribution.
研究論文（学術雑誌） - FAUST. XI. Enhancement of the complex organic material in the shocked matter surrounding the [BHB2007] 11 protobinary system
C. Vastel; T. Sakai; C. Ceccarelli; I. Jiménez-Serra; F. Alves; N. Balucani; E. Bianchi; M. Bouvier; P. Caselli; C. J. Chandler; S. Charnley; C. Codella; M. De Simone; F. Dulieu; L. Evans; F. Fontani; B. Lefloch; L. Loinard; F. Menard; L. Podio; G. Sabatini; N. Sakai; S. Yamamoto
Astronomy & Astrophysics, EDP Sciences, 684巻, 掲載ページ A189-A189, 出版日 2024年04月23日, Aims. Interstellar complex organic molecules (iCOMs) are species commonly found in the interstellar medium. They are believed to be crucial seed species for the build-up of chemical complexity in star forming regions as well as our own Solar System. Thus, understanding how their abundances evolve during the star formation process and whether it enriches the emerging planetary system is of paramount importance.
Methods. We use data from the ALMA Large Program FAUST (Fifty AU STudy of the chemistry in the disk and envelope system of solar protostars) to study the compact line emission towards the [BHB2007] 11 proto-binary system (sources A and B), where a complex structure of filaments connecting the two sources with a larger circumbinary disk has previously been detected. More than 45 methyl formate (CH3OCHO) lines are clearly detected with upper energies in the [123, 366] K range, as well as 8 dimethyl ether transitions (CH3OCH3) in the [93, 191] K range, 1 ketene transition (H2CCO) and 4 formic acid transitions (t-HCOOH). We compute the abundance ratios with respect to CH3OH for CH3OCHO, CH3OCH3, H2CCO, t-HCOOH (as well as an upper limit for CH3CHO) through a radiative transfer analysis. We also report the upper limits on the column densities of nitrogen bearing iCOMs, N(C2H5CN) and N(C2H3CN).
Results. The emission from the detected iCOMs and their precursors is compact and encompasses both protostars, which are separated by only 0.2″ (~28 au). The integrated intensities tend to align with the Southern filament, revealed by the high spatial resolution observations of the dust emission at 1.3 mm. A Position-Velocity and 2D analysis are performed on the strongest and uncontaminated CH3OCH3 transition and show three different spatial and velocity regions, two of them being close to 11B (Southern filament) and the third one near 11A.
Conclusions. All our observations suggest that the detected methanol, as well as the other iCOMs, are generated by the shocked gas from the incoming filaments streaming towards [BHB2007] 11A and 11B, respectively, making this source one of the few where chemical enrichment of the gas caused by the streaming material is observed.
研究論文（学術雑誌） - FAUST. XIII. Dusty cavity and molecular shock driven by IRS7B in the Corona Australis cluster
G. Sabatini; L. Podio; C. Codella; Y. Watanabe; M. De Simone; E. Bianchi; C. Ceccarelli; C. J. Chandler; N. Sakai; B. Svoboda; L. Testi; Y. Aikawa; N. Balucani; M. Bouvier; P. Caselli; E. Caux; L. Chahine; S. Charnley; N. Cuello; F. Dulieu; L. Evans; D. Fedele; S. Feng; F. Fontani; T. Hama; T. Hanawa; E. Herbst; T. Hirota; A. Isella; I. Jímenez-Serra; D. Johnstone; B. Lefloch; R. Le Gal; L. Loinard; H. B. Liu; A. López-Sepulcre; L. T. Maud; M. J. Maureira; F. Menard; A. Miotello; G. Moellenbrock; H. Nomura; Y. Oba; S. Ohashi; Y. Okoda; Y. Oya; J. Pineda; A. Rimola; T. Sakai; D. Segura-Cox; Y. Shirley; C. Vastel; S. Viti; N. Watanabe; Y. Zhang; Z. E. Zhang; S. Yamamoto
Astronomy & Astrophysics, EDP Sciences, 684巻, 掲載ページ L12-L12, 出版日 2024年04月10日, 査読付, Context. The origin of the chemical diversity observed around low-mass protostars probably resides in the earliest history of these systems.
Aims. We aim to investigate the impact of protostellar feedback on the chemistry and grain growth in the circumstellar medium of multiple stellar systems.
Methods. In the context of the ALMA Large Program FAUST, we present high-resolution (50 au) observations of CH3OH, H2CO, and SiO and continuum emission at 1.3 mm and 3 mm towards the Corona Australis star cluster.
Results. Methanol emission reveals an arc-like structure at ∼1800 au from the protostellar system IRS7B along the direction perpendicular to the major axis of the disc. The arc is located at the edge of two elongated continuum structures that define a cone emerging from IRS7B. The region inside the cone is probed by H2CO, while the eastern wall of the arc shows bright emission in SiO, a typical shock tracer. Taking into account the association with a previously detected radio jet imaged with JVLA at 6 cm, the molecular arc reveals for the first time a bow shock driven by IRS7B and a two-sided dust cavity opened by the mass-loss process. For each cavity wall, we derive an average H2 column density of ∼7 × 1021 cm−2, a mass of ∼9 × 10−3 M⊙, and a lower limit on the dust spectral index of 1.4.
Conclusions. These observations provide the first evidence of a shock and a conical dust cavity opened by the jet driven by IRS7B, with important implications for the chemical enrichment and grain growth in the envelope of Solar System analogues.
研究論文（学術雑誌） - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). X. Hot Gas Reveals Deeply Embedded Star Formation
Natsuko Izumi; Patricio Sanhueza; Patrick M. Koch; Xing Lu; Shanghuo Li; Giovanni Sabatini; Fernando A. Olguin; Qizhou Zhang; Fumitaka Nakamura; Ken’ichi Tatematsu; Kaho Morii; Takeshi Sakai; Daniel Tafoya
The Astrophysical Journal, American Astronomical Society, 963巻, 2号, 掲載ページ 163-163, 出版日 2024年03月01日, 査読付, Abstract
Massive infrared dark clouds (IRDCs) are considered to host the earliest stages of high-mass star formation. In particular, 70 μm dark IRDCs are the colder and more quiescent clouds. At a scale of about 5000 au using formaldehyde (H2CO) emission, we investigate the kinetic temperature of dense cores in 12 IRDCs obtained from the pilot Atacama Large Millimeter/submillimeter Array Survey of 70 μm dark High-mass clumps in Early Stages (ASHES). Compared to the 1.3 mm dust continuum and other molecular lines, such as C18O and deuterated species, we find that H2CO is mainly sensitive to low-velocity outflow components rather than to quiescent gas expected in the early phases of star formation. The kinetic temperatures of these components range from 26 to 300 K. The Mach number reaches about 15 with an average value of about 4, suggesting that the velocity distribution of gas traced by H2CO is significantly influenced by a supersonic nonthermal component. In addition, we detect warm line emission from HC3N and OCS in 14 protostellar cores, which requires high excitation temperatures (Eu/k ∼ 100 K). These results show that some of the embedded cores in the ASHES fields are in an advanced evolutionary stage, previously unexpected for 70 μm dark IRDCs.
研究論文（学術雑誌） - Observations of high-order multiplicity in a high-mass stellar protocluster
Shanghuo Li; Patricio Sanhueza; Henrik Beuther; Huei-Ru Vivien Chen; Rolf Kuiper; Fernando A. Olguin; Ralph E. Pudritz; Ian W. Stephens; Qizhou Zhang; Fumitaka Nakamura; Xing Lu; Rajika L. Kuruwita; Takeshi Sakai; Thomas Henning; Kotomi Taniguchi; Fei Li
Nature Astronomy, Springer Science and Business Media LLC, 8巻, 4号, 掲載ページ 472-481, 出版日 2024年01月15日, 査読付, Abstract
The dominant mechanism forming multiple stellar systems in the high-mass regime (M* ≳ 8 M⊙) remained unknown because direct imaging of multiple protostellar systems at early phases of high-mass star formation is very challenging. High-mass stars are expected to form in clustered environments containing binaries and higher-order multiplicity systems. So far only a few high-mass protobinary systems, and no definitive higher-order multiples, have been detected. Here we report the discovery of one quintuple, one quadruple, one triple and four binary protostellar systems simultaneously forming in a single high-mass protocluster, G333.23–0.06, using Atacama Large Millimeter/submillimeter Array high-resolution observations. We present a new example of a group of gravitationally bound binary and higher-order multiples during their early formation phases in a protocluster. This provides the clearest direct measurement of the initial configuration of primordial high-order multiple systems, with implications for the in situ multiplicity and its origin. We find that the binary and higher-order multiple systems, and their parent cores, show no obvious sign of disk-like kinematic structure. We conclude that the observed fragmentation into binary and higher-order multiple systems can be explained by core fragmentation, indicating its crucial role in establishing the multiplicity during high-mass star cluster formation.
研究論文（学術雑誌） - Design and Optimization of Nine-Section Broadband Quadrature Hybrid Coupler Using Strip Line Structure Focused on Thru and Coupled Characteristics
Taiyo Ushiyama; Tsuyoshi Narita; Sayu Tomioka; Satoshi Ono; Sho Masui; Takafumi Kojima; Takeshi Sakai
Journal of The Japan Institute of Electronics Packaging, Japan Institute of Electronics Packaging, 出版日 2024年
研究論文（学術雑誌） - Development Status of Wideband Millimeter-Wave Receivers for LMT-FINER
Haoran Kang; Takafumi Kojima; Takeshi Sakai; Yoichi Tamura; Airi Tetsuka; Sho Masui; Tatsuya Takekoshi
Proceedings of SPIE - The International Society for Optical Engineering, 13102巻, 出版日 2024年
研究論文（国際会議プロシーディングス） - FINER: Far-Infrared Nebular Emission Receiver for the Large Millimeter Telescope
Yoichi Tamura; Takeshi Sakai; Ryohei Kawabe; Takafumi Kojima; Akio Taniguchi; Tatsuya Takekoshi; Haoran Kang; Wenlei Shan; Masato Hagimoto; Norika Okauchi; Airi Tetsuka; Akio K. Inoue; Kotaro Kohno; Kunihiko Tanaka; Tom J.L.C. Bakx; Yoshinobu Fudamoto; Kazuyuki Fujita; Yuichi Harikane; Takuya Hashimoto; Bunyo Hatsukade; David H. Hughes; Takahiro Iino; Yuki Kimura; Hiroyuki Maezawa; Yuichi Matsuda; Ken Mawatari; Taku Nakajima; Shunichi Nakatsubo; Tai Oshima; Hideo Sagawa; F. Peter Schloerb; Shigeru Takahashi; Kotomi Taniguchi; Akiyoshi Tsujita; Hideki Umehata; Teppei Yonetsu; Min S. Yun
Proceedings of SPIE - The International Society for Optical Engineering, 13102巻, 出版日 2024年
研究論文（国際会議プロシーディングス） - A 10.24-GHz-wide digital spectrometer array system for LMT-FINER: system design and laboratory performance verification
Masato Hagimoto; Akio Taniguchi; Yoichi Tamura; Norika Okauchi; Hiroaki Kawamoto; Taku Nakajima; Takumi Hikosaka; Kenichi Harada; Toru Taniguchi; Takeshi Kamazaki; Takeshi Sakai; Kunihiko Tanaka; Ryohei Kawabe
Proceedings of SPIE - The International Society for Optical Engineering, 13102巻, 出版日 2024年
研究論文（国際会議プロシーディングス） - Digging into the Interior of Hot Cores with ALMA: Spiral Accretion into the High-mass Protostellar Core G336.01–0.82
Fernando A. Olguin; Patricio Sanhueza; Huei-Ru Vivien Chen; Xing Lu; Yoko Oya; Qizhou Zhang; Adam Ginsburg; Kotomi Taniguchi; Shanghuo Li; Kaho Morii; Takeshi Sakai; Fumitaka Nakamura
The Astrophysical Journal Letters, American Astronomical Society, 959巻, 2号, 掲載ページ L31-L31, 出版日 2023年12月01日, 査読付, Abstract
We observed the high-mass star-forming core G336.01–0.82 at 1.3 mm and 0.″05 (∼150 au) angular resolution with the Atacama Large Millimeter/submillimeter Array (ALMA) as part of the Digging into the Interior of Hot Cores with ALMA survey. These high-resolution observations reveal two spiral streamers feeding a circumstellar disk at opposite sides in great detail. Molecular line emission from CH3OH shows velocity gradients along the streamers consistent with infall. Similarly, a flattened envelope model with rotation and infall implies a mass larger than 10 M☉ for the central source and a centrifugal barrier of 300 au. The location of the centrifugal barrier is consistent with local peaks in the continuum emission. We argue that gas brought by the spiral streamers is accumulating at the centrifugal barrier, which can result in future accretion burst events. A total high infall rate of ∼4 × 10−4M☉ yr−1 is derived by matching models to the observed velocity gradient along the streamers. Their contribution accounts for 20%–50% the global infall rate of the core, indicating streamers play an important role in the formation of high-mass stars.
研究論文（学術雑誌）, 英語 - Laboratory Measurement of CH2DOH Line Intensities in the Millimeter-wave Region
Takahiro Oyama; Yuki Ohno; Akemi Tamanai; Yoshimasa Watanabe; Satoshi Yamamoto; Takeshi Sakai; Shaoshan Zeng; Riouhei Nakatani; Nami Sakai
The Astrophysical Journal, 957巻, 掲載ページ 4, 出版日 2023年11月01日, 査読付
研究論文（学術雑誌）, 英語 - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
Kaho Morii; Patricio Sanhueza; Fumitaka Nakamura; Qizhou Zhang; Giovanni Sabatini; Henrik Beuther; Xing Lu; Shanghuo Li; Guido Garay; James M. Jackson; Fernando A. Olguin; Daniel Tafoya; Ken’ichi Tatematsu; Natsuko Izumi; Takeshi Sakai; Andrea Silva
The Astrophysical Journal, American Astronomical Society, 950巻, 2号, 掲載ページ 148-148, 出版日 2023年06月01日, Abstract
The initial conditions found in infrared dark clouds (IRDCs) provide insights on how high-mass stars and stellar clusters form. We have conducted high-angular resolution and high-sensitivity observations toward thirty-nine massive IRDC clumps, which have been mosaicked using the 12 and 7 m arrays from the Atacama Large Millimeter/submillimeter Array. The targets are 70 μm dark massive (220–4900 M⊙), dense (>104 cm−3), and cold (∼10–20 K) clumps located at distances between 2 and 6 kpc. We identify an unprecedented number of 839 cores, with masses between 0.05 and 81 M⊙ using 1.3 mm dust continuum emission. About 55% of the cores are low-mass (<1 M⊙), whereas ≲1% (7/839) are high-mass (≳27 M⊙). We detect no high-mass prestellar cores. The most massive cores (MMC) identified within individual clumps lack sufficient mass to form high-mass stars without additional mass feeding. We find that the mass of the MMCs is correlated with the clump surface density, implying denser clumps produce more massive cores. There is no significant mass segregation except for a few tentative detections. In contrast, most clumps show segregation once the clump density is considered instead of mass. Although the dust continuum emission resolves clumps in a network of filaments, some of which consist of hub-filament systems, the majority of the MMCs are not found in the hubs. Our analysis shows that high-mass cores and MMCs have no preferred location with respect to low-mass cores at the earliest stages of high-mass star formation.
研究論文（学術雑誌） - Development of seven-beam optics using dielectric lenses for a new 72–116 GHz receiver in the Nobeyama 45 m telescope
Yasumasa Yamasaki; Yutaka Hasegawa; Sho Yoneyama; Sana Kawashita; Tsubasa Chinen; Sho Masui; Chiaki Nosohara; Heyang Sun; Shuto Dakie; Akira Kameyama; Ikko Fujitomo; Yuma Nishikawa; Hideo Ogawa; Ken’ichi Tatematsu; Atsushi Nishimura; Chieko Miyazawa; Toshikazu Takahashi; Jun Maekawa; Alvaro Gonzalez; Takafumi Kojima; Hiroaki Imada; Keiko Kaneko; Ryo Sakai; Takeshi Sakai; Toshikazu Onishi
Publications of the Astronomical Society of Japan, Oxford University Press (OUP), 出版日 2023年03月28日, Abstract
We developed a new seven-beam heterodyne receiver “7BEE” in the 72–116 GHz band for the Nobeyama 45 m telescope to investigate the early stage of star formation by deriving the deuterium fraction of dense cores. The optics for the receiver employs wideband corrugated horns covering the 72–116 GHz band and dielectric lenses to couple the incoming radiation from the antenna on to the feeds. One of the important aspects in the lens design is the anti-reflection (AR) structure to mitigate the reflections on the lens surfaces. Triangular grooves, which gradually change the effective refractive index from air to dielectric, were adopted as a basic AR design since the return loss can be in the order of 20 dB or better. The main goal of this study is to compare the radio frequency (RF) characteristics of the lenses with different patterns and sizes of AR grooving structures. We confirmed that concentric grooves degraded beam symmetry, cross-polarization characteristics, and aperture efficiency due to the birefringence of the grooves, which gave rise to wavefront distortions. Straight grooves of two different gap widths, 1.2 mm and 1.7 mm, were compared and showed similar good performance in terms of beam patterns and noise contribution. However, the latter showed a few percent higher aperture efficiency. Therefore, the straight grooves with 1.7 mm gap width were adopted as the AR structure of our lens.
研究論文（学術雑誌） - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). VII. Chemistry of Embedded Dense Cores
Shanghuo Li; Patricio Sanhueza; Xing Lu; Chang Won Lee; Qizhou Zhang; Stefano Bovino; Giovanni Sabatini; Tie Liu; Kee-Tae Kim; Kaho Morii; Daniel Tafoya; Ken’ichi Tatematsu; Takeshi Sakai; Junzhi Wang; Fei Li; Andrea Silva; Natsuko Izumi; David Allingham
The Astrophysical Journal, American Astronomical Society, 939巻, 2号, 掲載ページ 102-102, 出版日 2022年11月01日, 査読付, Abstract
We present a study of the chemistry toward 294 dense cores in 12 molecular clumps, using data obtained from the ALMA Survey of 70 μm dark High-mass clumps in Early Stages. We identified 97 protostellar cores and 197 prestellar core candidates, based on the detection of outflows and molecular transitions of high upper-energy levels (Eu/k > 45 K). The detection rate of the N2D+ emission toward the protostellar cores is 38%, which is higher than 9% for the prestellar cores, indicating that N2D+ does not exclusively trace prestellar cores. The detection rates of the DCO+ emission are 35% for the prestellar cores and 49% for the protostellar cores, which are higher than those for N2D+, implying that DCO+ appears more frequently than N2D+ in both prestellar and protostellar cores. Both the N2D+ and DCO+ abundances appear to decrease from the prestellar to the protostellar stage. The DCN, C2D, and 13CS emission lines are rarely seen in the dense cores of early evolutionary phases. The detection rate of the H2CO emission toward dense cores is 52%, three times higher than that for CH3OH (17%). In addition, the H2CO detection rate, abundance, line intensities, and line widths increase with the core evolutionary status, suggesting that the H2CO line emission is sensitive to protostellar activity.
研究論文（学術雑誌） - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). VI. The Core-scale CO Depletion
Sabatini, Giovanni; Bovino, Stefano; Sanhueza, Patricio; Morii, Kaho; Li, Shanghuo; Redaelli, Elena; Zhang, Qizhou; Lu, Xing; Feng, Siyi; Tafoya, Daniel; Izumi, Natsuko; Sakai, Takeshi; Tatematsu, Ken'ichi; Allingham, David
The Astrophysical Journal, American Astronomical Society, 936巻, 1号, 掲載ページ id. 80-80, 出版日 2022年09月, 査読付, Abstract
Studying the physical and chemical properties of cold and dense molecular clouds is crucial for the understanding of how stars form. Under the typical conditions of infrared dark clouds, CO is removed from the gas phase and trapped onto the surface of dust grains by the so-called depletion process. This suggests that the CO-depletion factor (fD) can be a useful chemical indicator for identifying cold and dense regions (i.e., prestellar cores). We have used the 1.3 mm continuum and C18O (2–1) data observed at the resolution of ∼5000 au in the ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES) to construct averaged maps of fD in 12 clumps to characterize the earliest stages of the high-mass star formation process. The average fD determined for 277 of the 294 ASHES cores follows an unexpected increase from the prestellar to the protostellar stage. If we exclude the temperature effect due to the slight variations in the NH3 kinetic temperature among different cores, we explain this result as a dependence primarily on the average gas density, which increases in cores where protostellar conditions prevail. This shows that fD determined in high-mass star-forming regions at the core scale is insufficient to distinguish among prestellar and protostellar conditions for the individual cores and should be complemented by information provided by additional tracers. However, we confirm that the clump-averaged fD values correlate with the luminosity-to-mass ratio of each source, which is known to trace the evolution of the star formation process.
研究論文（学術雑誌）, 英語 - FAUST
Charlotte VASTEL; F. Alves; C. Ceccarelli; M. Bouvier; I. Jiménez-Serra; T. Sakai; P. Caselli; L. Evans; F. Fontani; R. Le Gal; C. J. Chandler; B. Svoboda; L. Maud; C. Codella; N. Sakai; A. Lόpez-Sepulcre; G. Moellenbrock; Y. Aikawa; N. Balucani; E. Bianchi; G. Busquet; E. Caux; S. Charnley; N. Cuello; M. De Simone; F. Dulieu; A. Durân; D. Fedele; S. Feng; L. Francis; T. Hama; T. Hanawa; E. Herbst; T. Hirota; M. Imai; A. Isella; D. Johnstone; B. Lefloch; L. Loinard; M. Maureira; N. M. Murillo; S. Mercimek; S. Mori; F. Menard; A. Miotello; R. Nakatani; H. Nomura; Y. Oba; S. Ohashi; Y. Okoda; J. Ospina-Zamudio
Astronomy & Astrophysics, {EDP} Sciences, 664巻, 出版日 2022年08月,
研究論文（学術雑誌） - FAUST. V. Hot methanol in the [BHB2007] 11 protobinary system; hot corino versus shock origin
Vastel, C; Alves, F; Ceccarelli, C; Bouvier, M; Jiménez-Serra, I; Sakai, T; Caselli, P; Evans, L; Fontani, F; Le Gal, R; Chandler, C. J; Svoboda, B; Maud, L; Codella, C; Sakai, N; López-Sepulcre, A; Moellenbrock, G; Aikawa, Y; Balucani, N; Bianchi, E; Busquet, G; Caux, E; Charnley, S; Cuello, N; De Simone, M; Dulieu, F; Durân, A; Fedele, D; Feng, S; Francis, L; Hama, T; Hanawa, T; Herbst, E; Hirota, T; Imai, M; Isella, A; Johnstone, D; Lefloch, B; Loinard, L
Astronomy & Astrophysics, 664巻, 掲載ページ id. A171, 出版日 2022年08月, 査読付
研究論文（学術雑誌）, 英語 - Chemical and Physical Characterization of the Isolated Protostellar Source CB68: FAUST IV
Imai, Muneaki; Oya, Yoko; Svoboda, Brian; Liu; Hauyu Baobab; Lefloch, Bertrand; Viti, Serena; Zhang, Yichen; Ceccarelli, Cecilia; Codella, Claudio; Chandler, Claire J; Sakai, Nami; Aikawa, Yuri; Alves, Felipe O; Balucani, Nadia; Bianchi, Eleonora; Bouvier, Mathilde; Busquet, Gemma; Caselli, Paola; Caux, Emmanuel; Charnley, Steven; Choudhury, Spandan; Cuello, Nicolas; Simone, Marta De; Dulieu, Francois; Durán, Aurora; Evans, Lucy; Favre, Cécile; Fedele, Davide; Feng, Siyi; Fontani, Francesco
The Astrophysical Journal, 934巻, 1号, 掲載ページ id. 70, 出版日 2022年07月, 査読付
研究論文（学術雑誌）, 英語 - Laboratory Measurement of Millimeter-wave Transitions of 13CH2DOH for Astronomical Use
Ohno, Yuki; Oyama, Takahiro; Tamanai, Akemi; Zeng, Shaoshan; Watanabe, Yoshimasa; Nakatani, Riouhei; Sakai, Takeshi; Sakai, Nami
The Astrophysical Journal, 932巻, 2号, 掲載ページ id. 101, 出版日 2022年06月, 査読付
研究論文（学術雑誌）, 英語 - Nobeyama Survey of Inward Motions toward Cores in Orion Identified by SCUBA-2
Tatematsu, Ken'ichi; Yeh, You-Ting; Hirano, Naomi; Liu, Sheng-Yuan; Liu, Tie; Dutta, Somnath; Sahu, Dipen; Evans, Neal J., II; Juvela, Mika; Yi, Hee-Weon; Lee, Jeong-Eun; Sanhueza, Patricio; Li, Shanghuo; Eden, David; Kim, Gwanjeong; Lee, Chin-Fei; Wu, Yuefang; Kim, Kee-Tae; Tóth, L. Viktor; Choi, Minho; Kang, Miju; Thompson, Mark A; Fuller, Gary A; Li, Di; Wang, Ke; Sakai, Takeshi; Kandori, Ryo; Hsu, Shih-Ying; Chiong, Chau-Ching; Almasop" Collaboration
The Astrophysical Journal, 931巻, 1号, 掲載ページ id. 33, 出版日 2022年05月, 査読付
研究論文（学術雑誌）, 英語 - Digging into the Interior of Hot Cores with ALMA (DIHCA). II. Exploring the Inner Binary (Multiple) System Embedded in G335 MM1 ALMA1
Olguin, Fernando A; Sanhueza, Patricio; Ginsburg, Adam; Chen, Huei-Ru Vivien; Zhang, Qizhou; Li, Shanghuo; Lu, Xing; Sakai, Takeshi
The Astrophysical Journal, 929巻, 1号, 掲載ページ id. 68, 出版日 2022年04月, 査読付
研究論文（学術雑誌）, 英語 - Misaligned Rotations of the Envelope, Outflow, and Disks in the Multiple Protostellar System of VLA 1623-2417: FAUST. III
Ohashi, Satoshi; Codella, Claudio; Sakai, Nami; Chandler, Claire J; Ceccarelli, Cecilia; Alves, Felipe; Fedele, Davide; Hanawa, Tomoyuki; Durán, Aurora; Favre, Cécile; López-Sepulcre, Ana; Loinard, Laurent; Mercimek, Seyma; Murillo, Nadia M; Podio, Linda; Zhang, Yichen; Aikawa, Yuri; Balucani, Nadia; Bianchi, Eleonora; Bouvier, Mathilde; Busquet, Gemma; Caselli, Paola; Caux, Emmanuel; Charnley, Steven; Choudhury, Spandan; Cuello, Nicolas; De Simone, Marta; Dulieu, Francois; Evans, Lucy; Feng
The Astrophysical Journal, American Astronomical Society, 927巻, 1号, 掲載ページ id. 54-54, 出版日 2022年03月, 査読付,Abstract
We report a study of the low-mass Class 0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using H13CO+ (J = 3–2), CS (J = 5–4), and CCH (N = 3–2) lines as part of the ALMA Large Program FAUST. The analysis of the velocity fields revealed the rotation motion in the envelope and the velocity gradients in the outflows (about 2000 au down to 50 au). We further investigated the rotation of the circumbinary VLA 1623A disk, as well as the VLA 1623B disk. We found that the minor axis of the circumbinary disk of VLA 1623A is misaligned by about 12° with respect to the large-scale outflow and the rotation axis of the envelope. In contrast, the minor axis of the circumbinary disk is parallel to the large-scale magnetic field according to previous dust polarization observations, suggesting that the misalignment may be caused by the different directions of the envelope rotation and the magnetic field. If the velocity gradient of the outflow is caused by rotation, the outflow has a constant angular momentum and the launching radius is estimated to be 5–16 au, although it cannot be ruled out that the velocity gradient is driven by entrainments of the two high-velocity outflows. Furthermore, we detected for the first time a velocity gradient associated with rotation toward the VLA 16293B disk. The velocity gradient is opposite to the one from the large-scale envelope, outflow, and circumbinary disk. The origin of its opposite gradient is also discussed.
研究論文（学術雑誌）, 英語 - The ALMA Survey of 70 mu m Dark High-mass Clumps in Early Stages (ASHES). V. Deuterated Molecules in the 70 mu m Dark IRDC G14.492-00.139
Takeshi Sakai; Patricio Sanhueza; Kenji Furuya; Ken'ichi Tatematsu; Shanghuo Li; Yuri Aikawa; Xing Lu; Qizhou Zhang; Kaho Morii; Fumitaka Nakamura; Hideaki Takemura; Natsuko Izumi; Tomoya Hirota; Andrea Silva; Andres E. Guzman; Nami Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 925巻, 2号, 出版日 2022年02月
研究論文（学術雑誌）, 英語 - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). IV. Star Formation Signatures in G023.477
Morii, Kaho; Sanhueza; Patricio, Nakamura; Fumitaka, Jackson; James M., Li; Shanghuo, Beuther; Henrik, Zhang; Qizhou, Feng; Siyi, Tafoya; Daniel, Guzmán; Andrés E; Izumi; Natsuko, Sakai; Takeshi, Lu; Xing, Tatematsu; Ken'ichi, Ohashi; Satoshi, Silva; Andrea, Olguin; Fernando A; Contreras, Yanett
The Astrophysical Journal, American Astronomical Society, 923巻, 2号, 掲載ページ id. 147-147, 出版日 2021年12月, 査読付, Abstract
With a mass of ∼1000 M⊙ and a surface density of ∼0.5 g cm−2, G023.477+0.114, also known as IRDC 18310-4, is an infrared dark cloud (IRDC) that has the potential to form high-mass stars and has been recognized as a promising prestellar clump candidate. To characterize the early stages of high-mass star formation, we have observed G023.477+0.114 as part of the Atacama Large Millimeter/submillimeter Array (ALMA) Survey of 70 μm Dark High-mass Clumps in Early Stages. We have conducted ∼1.″2 resolution observations with ALMA at 1.3 mm in dust continuum and molecular line emission. We have identified 11 cores, whose masses range from 1.1 to 19.0 M⊙. Ignoring magnetic fields, the virial parameters of the cores are below unity, implying that the cores are gravitationally bound. However, when magnetic fields are included, the prestellar cores are close to virial equilibrium, while the protostellar cores remain sub-virialized. Star formation activity has already started in this clump. Four collimated outflows are detected in CO and SiO. H2CO and CH3OH emission coincide with the high-velocity components seen in the CO and SiO emission. The outflows are randomly oriented for the natal filament and the magnetic field. The position-velocity diagrams suggest that episodic mass ejection has already begun even in this very early phase of protostellar formation. The masses of the identified cores are comparable to the expected maximum stellar mass that this IRDC could form (8–19 M⊙). We explore two possibilities on how IRDC G023.477+0.114 could eventually form high-mass stars in the context of theoretical scenarios.
研究論文（学術雑誌）, 英語 - Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey
Tatematsu; Ken'ichi, Kim; Gwanjeong, Liu; Tie, Evans; Neal J; II, Yi; Hee-Weon, Lee; Jeong-Eun, Wu; Yuefang, Hirano; Naomi, Liu; Sheng-Yuan, Dutta; Somnath, Sahu; Dipen, Sanhueza; Patricio, Kim; Kee-Tae, Juvela; Mika, Tóth; L. Viktor; Fehér; Orsolya, He; Jinhua, Ge; Jixing; Feng, Siyi; Choi, Minho; Kang, Miju; Thompson; Mark A; Fuller; Gary A., Li; Di, Ristorcelli; Isabelle, Wang, Ke; di Francesco; James, Eden; David; Ohashi, Satoshi; Kandori, Ryo; Vastel, Charlotte; Hirota, Tomoya; Sakai, Tak
The Astrophysical Journal Supplement Series, 256巻, 2号, 掲載ページ id. 25, 出版日 2021年10月, 査読付
研究論文（学術雑誌）, 英語 - Exploring the 100 au Scale Structure of the Protobinary System NGC 2264 CMM3 with ALMA
Yoshiki Shibayama; Yoshimasa Watanabe; Yoko Oya; Nami Sakai; Ana López-Sepulcre; Sheng-Yuan Liu; Yu-Nung Su; Yichen Zhang; Takeshi Sakai; Tomoya Hirota; Satoshi Yamamoto
The Astrophysical Journal, 918巻, 1号, 掲載ページ id. 32, 出版日 2021年09月, 査読付
研究論文（学術雑誌）, 英語 - Gravity Driven Magnetic Field at ~1000 au Scales in High-mass Star Formation
Patricio Sanhueza; Josep Miquel Girart; Marco Padovani; Daniele Galli; Charles L. H. Hull; Qizhou Zhang; Paulo Cortes; Ian W. Stephens; Manuel Fernandez-Lopez; James M. Jackson; Pau Frau; Patrick M. Kock; Benjamin Wu; Luis A. Zapata; Fernando Olguin; Xing Lu; Andrea Silva; Ya-Wen Tang; Takeshi Sakai; Andres E. Guzman; Ken'ichi Tatematsu; Fumitaka Nakamura; Huei-Ru Vivien Chen
The Astrophysical Journal Letters, 915巻, 1号, 掲載ページ id. L10, 出版日 2021年07月, 査読付
研究論文（学術雑誌）, 英語 - Erratum: “The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars” (2021, ApJ, 910, 20)
Yao-Lun Yang; Nami Sakai; Yichen Zhang; Nadia M. Murillo; Ziwei E. Zhang; Aya E. Higuchi; Shaoshan Zeng; Ana López-Sepulcre; Satoshi Yamamoto; Bertrand Lefloch; Mathilde Bouvier; Cecilia Ceccarelli; Tomoya Hirota; Muneaki Imai; Yoko Oya; Takeshi Sakai; Yoshimasa Watanabe
The Astrophysical Journal, American Astronomical Society, 913巻, 2号, 掲載ページ 155-155, 出版日 2021年06月01日
研究論文（学術雑誌） - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). III. A Young Molecular Outflow Driven by a Decelerating Jet
Daniel Tafoya; Patricio Sanhueza; Qizhou Zhang; Shanghuo Li; Andrés E. Guzmán; Andrea Silva; Eduardo de la Fuente; Xing Lu; Kaho Morii; Ken'ichi Tatematsu; Yanett Contreras; Natsuko Izumi; James M. Jackson; Fumitaka Nakamura; Takeshi Sakai
The Astrophysical Journal, American Astronomical Society, 913巻, 2号, 掲載ページ id.131-131, 出版日 2021年06月, 査読付, Abstract
We present a spatio-kinematical analysis of the CO (J = 2 → 1) line emission, observed with the Atacama Large Millimeter/submillimeter Array (ALMA), of the outflow associated with the most massive core, ALMA1, in the 70 μm dark clump G010.991–00.082. The position–velocity (PV) diagram of the molecular outflow exhibits a peculiar S-shaped morphology that has not been seen in any other star-forming region. We propose a spatio-kinematical model for the bipolar molecular outflow that consists of a decelerating high-velocity component surrounded by a slower component whose velocity increases with distance from the central source. The physical interpretation of the model is in terms of a jet that decelerates as it entrains material from the ambient medium, which has been predicted by calculations and numerical simulations of molecular outflows in the past. One side of the outflow is shorter and shows a stronger deceleration, suggesting that the medium through which the jet moves is significantly inhomogeneous. The age of the outflow is estimated to be τ ≈ 1300 yr, after correction for a mean inclination of the system of ≈57°.
研究論文（学術雑誌）, 英語 - Spectrometer Using superconductor MIxer Receiver (SUMIRE) for laboratory submillimeter spectroscopy
Watanabe, Yoshimasa; Chiba, Yutaro; Sakai, Takeshi; Tamanai, Akemi; Suzuki, Rikako; Sakai, Nami
Publications of the Astronomical Society of Japan, 73巻, 2号, 掲載ページ 372-393, 出版日 2021年04月, 査読付
研究論文（学術雑誌）, 英語 - FAUST. II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
Yuki Okoda; Yoko Oya; Logan Francis; Doug Johnstone; Shu-ichiro Inutsuka; Cecilia Ceccarelli; Claudio Codella; Claire Chandler; Nami Sakai; Yuri Aikawa; Felipe O. Alves; Nadia Balucani; Eleonora Bianchi; Mathilde Bouvier; Paola Caselli; Emmanuel Caux; Steven Charnley; Spandan Choudhury; Marta De Simone; Francois Dulieu; Aurora Duran; Lucy Evans; Cecile Favre; Davide Fedele; Siyi Feng; Francesco Fontani; Tetsuya Hama; Tomoyuki Hanawa; Eric Herbst; Tomoya Hirota; Muneaki Imai; Andrea Isella; Izaskun Jimenez-Serra; Claudine Kahane; Bertrand Lefloch; Laurent Loinard; Ana Lopez-Sepulcre; Luke T. Maud; Maria Jose Maureira; Francois Menard; Seyma Mercimek; Anna Miotello; George Moellenbrock; Shoji Mori; Nadia M. Murillo; Riouhei Nakatani; Hideko Nomura; Yasuhiro Oba; Ross O'Donoghue; Satoshi Ohashi; Juan Ospina-Zamudio; Jaime E. Pineda; Linda Podio; Albert Rimola; Takeshi Sakai; Dominique Segura-Cox; Yancy Shirley; Brian Svoboda; Vianney Taquet; Leonardo Testi; Charlotte Vastel; Serena Viti; Naoki Watanabe; Yoshimasa Watanabe; Arezu Witzel; Ci Xue; Yichen Zhang; Bo Zhao; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 910巻, 1号, 出版日 2021年03月
研究論文（学術雑誌）, 英語 - Digging into the Interior of Hot Cores with ALMA (DIHCA). I. Dissecting the High-mass Star-forming Core G335.579-0.292 MM1
Olguin, Fernando A; Sanhueza, Patricio; Guzmán; Andrés E; Lu, Xing; Saigo, Kazuya; Zhang, Qizhou; Silva, Andrea; Chen, Huei-Ru Vivien; Li, Shanghuo; Ohashi, Satoshi; Nakamura, Fumitaka; Sakai, Takeshi; Wu, Benjamin
The Astrophysical Journal, 909巻, 2号, 掲載ページ id. 199, 出版日 2021年03月, 査読付
研究論文（学術雑誌）, 英語 - The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars
Yang, Yao-Lun; Sakai, Nami; Zhang, Yichen; Murillo, Nadia M; Zhang, Ziwei E; Higuchi, Aya E; Zeng, Shaoshan; López-Sepulcre, Ana; Yamamoto, Satoshi; Lefloch, Bertrand; Bouvier, Mathilde; Ceccarelli, Cecilia; Hirota, Tomoya; Imai, Muneaki; Oya, Yoko; Sakai, Takeshi; Watanabe, Yoshimasa
The Astrophysical Journal, American Astronomical Society, 910巻, 1号, 掲載ページ id. 20-20, 出版日 2021年03月, 査読付
研究論文（学術雑誌）, 英語 - HCN J = 4-3, HNC J = 1-0, H13CN J = 1-0, and HC3N J = 10-9 Maps of Galactic Center Region. II. Physical Properties of Dense-gas Clumps and Probability of Star Formation
Tanaka, Kunihiko; Nagai, Makoto; Kamegai, Kazuhisa; Iino, Takahiro; Sakai, Takeshi
The Astrophysical Journal, 903巻, 2号, 掲載ページ id. 111, 出版日 2020年11月, 査読付
研究論文（学術雑誌）, 英語 - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). II. Molecular Outflows in the Extreme Early Stages of Protocluster Formation
Li, Shanghuo; Sanhueza, Patricio; Zhang, Qizhou; Nakamura, Fumitaka; Lu, Xing; Wang, Junzhi; Liu, Tie; Tatematsu, Ken'ichi; Jackson, James M; Silva, Andrea; Guzmán, Andrés E; Sakai, Takeshi; Izumi, Natsuko; Tafoya, Daniel; Li, Fei; Contreras, Yanett; Morii, Kaho; Kim, Kee-Tae
The Astrophysical Journal, American Astronomical Society, 903巻, 2号, 掲載ページ id. 119-119, 出版日 2020年11月, 査読付
研究論文（学術雑誌）, 英語 - FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS5
E Bianchi; C J Chandler; C Ceccarelli; C Codella; N Sakai; A López-Sepulcre; L T Maud; G Moellenbrock; B Svoboda; Y Watanabe; T Sakai; F Ménard; Y Aikawa; F Alves; N Balucani; M Bouvier; P Caselli; E Caux; S Charnley; S Choudhury; M De Simone; F Dulieu; A Durán; L Evans; C Favre; D Fedele; S Feng; F Fontani; L Francis; T Hama; T Hanawa; E Herbst; T Hirota; M Imai; A Isella; I Jiménez-Serra; D Johnstone; C Kahane; B Lefloch; L Loinard; M J Maureira; S Mercimek; A Miotello; S Mori; R Nakatani; H Nomura; Y Oba; S Ohashi; Y Okoda; J Ospina-Zamudio; Y Oya; J Pineda; L Podio; A Rimola; D Segura Cox; Y Shirley; V Taquet; L Testi; C Vastel; S Viti; N Watanabe; A Witzel; C Xue; Y Zhang; B Zhao; S Yamamoto
Monthly Notices of the Royal Astronomical Society: Letters, Oxford University Press (OUP), 498巻, 1号, 掲載ページ L87-L92, 出版日 2020年10月11日,ABSTRACT
The study of hot corinos in solar-like protostars has been so far mostly limited to the Class 0 phase, hampering our understanding of their origin and evolution. In addition, recent evidence suggests that planet formation starts already during Class I phase, which therefore represents a crucial step in the future planetary system chemical composition. Hence, the study of hot corinos in Class I protostars has become of paramount importance. Here, we report the discovery of a hot corino towards the prototypical Class I protostar L1551 IRS5, obtained within the ALMA (Atacama Large Millimeter/submillimeter Array) Large Program FAUST (Fifty AU STudy of the chemistry in the disc/envelope system of solar-like protostars). We detected several lines from methanol and its isotopologues (13CH3OH and CH2DOH), methyl formate, and ethanol. Lines are bright towards the north component of the IRS5 binary system, and a possible second hot corino may be associated with the south component. The methanol lines' non-LTE analysis constrains the gas temperature (∼100 K), density (≥1.5 × 108 cm−3), and emitting size (∼10 au in radius). All CH3OH and 13CH3OH lines are optically thick, preventing a reliable measure of the deuteration. The methyl formate and ethanol relative abundances are compatible with those measured in Class 0 hot corinos. Thus, based on this work, little chemical evolution from Class 0 to I hot corinos occurs.
研究論文（学術雑誌） - Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey
Gwanjeong Kim; Ken’ichi Tatematsu; Tie Liu; Hee-Weon Yi; Jinhua He; Naomi Hirano; Sheng-Yuan Liu; Minho Choi; Patricio Sanhueza; L. Viktor Tóth; Neal J. Evans II; Siyi Feng; Mika Juvela; Kee-Tae Kim; Charlotte Vastel; Jeong-Eun Lee; Quang Nguyễn Lu’o’; Miju Kang; Isabelle Ristorcelli; Orsolya Fehér; Yuefang Wu; Satoshi Ohashi; Ke Wang; Ryo Kandori; Tomoya Hirota; Takeshi Sakai; Xing Lu; Mark A. Thompson; Gary A. Fuller; Di Li; Hiroko Shinnaga; Jungha Kim
The Astrophysical Journal Supplement Series, American Astronomical Society, 249巻, 2号, 掲載ページ 33-33, 出版日 2020年08月12日
研究論文（学術雑誌） - A new off-point-less observing method for millimeter and submillimeter spectroscopy with a frequency-modulating local oscillator
Taniguchi, Akio; Tamura, Yoichi; Kohno, Kotaro; Takahashi, Shigeru; Horigome, Osamu; Maekawa, Jun; Sakai, Takeshi; Kuno, Nario; Minamidani, Tetsuhiro
Publications of the Astronomical Society of Japan, Oxford University Press (OUP), 72巻, 1号, 掲載ページ id. 2, 出版日 2020年02月, 査読付,Abstract
We propose a new observing method for single-dish millimeter and submillimeter spectroscopy using a heterodyne receiver equipped with a frequency-modulating local oscillator (FMLO). Unlike conventional switching methods, which extract astronomical signals by subtracting the reference spectra of off-sources from those of on-sources, the FMLO method does not need to obtain any off-source spectra; rather, it estimates them from the on-source spectra themselves. The principle uses high-dump-rate (10 Hz) spectroscopy with radio frequency modulation achieved by fast sweeping of a local oscillator of a heterodyne receiver. Because sky emission (i.e., off-source) fluctuates as $1/f$ and is spectrally correlated, it can be estimated and subtracted from time series spectra (a timestream) by principal component analysis. Meanwhile, astronomical signals remain in the timestream since they are modulated to a higher time-frequency domain. The FMLO method therefore achieves (1) a remarkably high observation efficiency, (2) reduced spectral baseline wiggles, and (3) software-based sideband separation. We developed an FMLO system for the Nobeyama $45\:$m telescope and a data reduction procedure for it. Frequency modulation was realized by a tunable and programmable first local oscillator. With observations of Galactic sources, we demonstrate that the observation efficiency of the FMLO method is dramatically improved compared to conventional switching methods. Specifically, we find that the time to achieve the same noise level is reduced by a factor of 3.0 in single-pointed observations and by a factor of 1.2 in mapping observations. The FMLO method can be applied to observations of fainter ($\sim$mK) spectral lines and larger ($\sim$deg$^{2}$) mapping. It offers much more efficient and baseline-stable observations compared to conventional switching methods.
研究論文（学術雑誌）, 英語 - Wideband technology development to increase the RF and instantaneous bandwidth of ALMA receivers
Takafumi Kojima; Kazunori Uemizu; Hitoshi Kiuchi; Tomonori Tamura; Keiko Kaneko; Ryo Sakai; Akihira Miyachi; Wenlei Shan; Yoshinori Uzawa; Alvaro Gonzalez; Matthias Kroug; Takeshi Sakai
Proceedings of SPIE - The International Society for Optical Engineering, SPIE, 11453巻, 出版日 2020年
研究論文（国際会議プロシーディングス）, 英語 - The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
Sanhueza, Patricio; Contreras, Yanett; Wu, Benjamin; Jackson, James M; Guzmán; Andrés E; Zhang, Qizhou; Li, Shanghuo; Lu, Xing; Silva, Andrea; Izumi, Natsuko; Liu, Tie; Miura, Rie E; Tatematsu, Ken’ichi; Sakai, Takeshi; Beuther, Henrik; Garay, Guido; Ohashi, Satoshi; Saito, Masao; Nakamura, Fumitaka; Saigo; Kazuya Veena; V. S; Nguyen-Luong, Quang; Tafoya, Daniel
The Astrophysical Journal, 886巻, 2号, 掲載ページ id. 102, 出版日 2019年12月, 査読付
研究論文（学術雑誌）, 英語 - Sulfur-bearing Species Tracing the Disk/Envelope System in the Class I Protostellar Source Elias 29
Oya, Yoko; López-Sepulcre, Ana; Sakai, Nami; Watanabe, Yoshimasa; Higuchi, Aya E; Hirota, Tomoya; Aikawa, Yuri; Sakai, Takeshi; Ceccarelli, Cecilia; Lefloch, Bertrand; Caux, Emmanuel; Vastel, Charlotte; Kahane, Claudine; Yamamoto, Satoshi
The Astrophysical Journal, 881巻, 2号, 掲載ページ id. 112, 出版日 2019年08月, 査読付
研究論文（学術雑誌）, 英語 - Design of on-chip broadband band selection filter for multi-chroic mm/submm Camera
Kah Wuy Chin; Tai Ohshima; Satoshi Ono; Takeshi Sakai; Tatsuya Takekoshi; Satoru Mima; Ryohei Kawabe; Masato Naruse; Keisuke Yoshioka; Shinsuke Uno
ISSTT 2019 - 30th International Symposium on Space Terahertz Technology, Proceedings Book, International Symposium on Space Terahertz Technology, 掲載ページ 99, 出版日 2019年
研究論文（国際会議プロシーディングス）, 英語 - Development of mm/submm broadband anti-reflection coating exploiting the various expanded PTFEs measured with THz-TDS
Tai Oshima; Keisuke Yoshioka; Tatsuya Takekoshi; Kah Wuy Chin; Shinsuke Uno; Takeshi Sakai
ISSTT 2019 - 30th International Symposium on Space Terahertz Technology, Proceedings Book, 掲載ページ 118, 出版日 2019年
研究論文（国際会議プロシーディングス） - An unbiased spectral line survey observation toward the low-mass star-forming region L1527
Yoshida, Kento; Sakai, Nami; Nishimura, Yuri; Tokudome, Tomoya; Watanabe, Yoshimasa; Sakai, Takeshi; Takano, Shuro; Yamamoto, Satoshi
Publications of the Astronomical Society of Japan, psy136巻, 出版日 2019年01月, 査読付
研究論文（学術雑誌）, 英語 - Deuterium Fractionation Survey Toward Protostellar Sources in the Perseus Molecular Cloud: HNC Case
Imai, Muneaki; Sakai, Nami; López-Sepulcre, Ana; Higuchi, Aya E; Zhang, Yichen; Oya, Yoko; Watanabe, Yoshimasa; Sakai, Takeshi; Ceccarelli, Cecilia; Lefloch, Bertrand; Yamamoto, Satoshi
The Astrophysical Journal, 869巻, 1号, 掲載ページ id. 51, 出版日 2018年12月, 査読付
研究論文（学術雑誌）, 英語 - Series-connected array of superconductor-insulator-superconductor junctions in the 100 GHz-band heterodyne mixer for FOREST on the Nobeyama 45 m telescope
Nakajima, Taku; Inoue, Hirofumi; Fujii, Yumi; Miyazawa, Chieko; Iwashita, Hiroyuki; Sakai, Takeshi; Noguchi, Takashi; Mizuno, Akira
Publications of the Astronomical Society of Japan, psy112巻, 出版日 2018年10月, 査読付
研究論文（学術雑誌）, 英語 - Rotation in the NGC 1333 IRAS 4C Outflow
Zhang, Yichen; Higuchi, Aya E; Sakai, Nami; Oya, Yoko; López-Sepulcre, Ana; Imai, Muneaki; Sakai, Takeshi; Watanabe, Yoshimasa; Ceccarelli, Cecilia; Lefloch, Bertrand; Yamamoto, Satoshi
The Astrophysical Journal, 864巻, 1号, 掲載ページ id. 76, 出版日 2018年09月, 査読付
研究論文（学術雑誌）, 英語 - Depletion of 15N in the center of L1544: Early transition from atomic to molecular nitrogen?
Furuya, K; Watanabe, Y; Sakai, T; Aikawa, Y; Yamamoto, S
Astronomy & Astrophysics, 615巻, 掲載ページ id. L16, 出版日 2018年07月, 査読付
研究論文（学術雑誌）, 英語 - Infall Signatures in a Prestellar Core Embedded in the High-mass 70 μm Dark IRDC G331.372-00.116
Contreras, Yanett; Sanhueza, Patricio; Jackson, James M; Guzmán, Andrés E; Longmore, Steven; Garay, Guido; Zhang, Qizhou; Nguyễn-Lu'o'ng, Quang; Tatematsu, Ken'ichi; Nakamura, Fumitaka; Sakai, Takeshi; Ohashi, Satoshi; Liu, Tie; Saito, Masao; Gomez, Laura; Rathborne, Jill; Whitaker, Scott
The Astrophysical Journal, 861巻, 1号, 掲載ページ id. 14, 出版日 2018年07月, 査読付
研究論文（学術雑誌）, 英語 - Magnetic fields at the onset of high-mass star formation
H. Beuther; J. D. Soler; W. Vlemmings; H. Linz; Th. Henning; R. Kuiper; R. Rao; R. Smith; T. Sakai; K. Johnston; A. Walsh; S. Feng
Astronomy and Astrophysics, EDP Sciences, 614巻, 掲載ページ id. A64, 出版日 2018年06月01日, 査読付
研究論文（学術雑誌）, 英語 - HCN J = 4-3, HNC J = 1-0, H13CN J = 1-0, and HC3N J = 10-9 Maps of the Galactic Center Region. I. Spatially Resolved Measurements of Physical Conditions and Chemical Composition
Tanaka, Kunihiko; Nagai, Makoto; Kamegai, Kazuhisa; Iino, Takahiro; Sakai, Takeshi
The Astrophysical Journal Supplement Series, 236巻, 2号, 掲載ページ id. 40, 出版日 2018年06月, 査読付
研究論文（学術雑誌）, 英語 - Chemical Survey toward Young Stellar Objects in the Perseus Molecular Cloud Complex
Higuchi, Aya E; Sakai, Nami; Watanabe, Yoshimasa; López-Sepulcre, Ana; Yoshida, Kento; Oya, Yoko; Imai, Muneaki; Zhang, Yichen; Ceccarelli, Cecilia; Lefloch, Bertrand; Codella, Claudio; Bachiller, Rafael; Hirota, Tomoya; Sakai, Takeshi; Yamamoto, Satoshi
The Astrophysical Journal Supplement Series, 236巻, 2号, 掲載ページ id. 52, 出版日 2018年06月, 査読付
研究論文（学術雑誌）, 英語 - ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules
Takeshi Sakai; Takahiro Yanagida; Kenji Furuya; Yuri Aikawa; Patricio Sanhueza; Nami Sakai; Tomoya Hirota; James M. Jackson; Satoshi Yamamoto
Astrophysical Journal, Institute of Physics Publishing, 857巻, 1号, 掲載ページ id. 35, 出版日 2018年04月10日, 査読付
研究論文（学術雑誌）, 英語 - Discovery of Striking Difference of Molecular-emission-line Richness in the Potential Proto-binary System NGC 2264 CMM3
Yoshimasa Watanabe; Nami Sakai; Ana Lopez-Sepulcre; Takeshi Sakai; Tomoya Hirota; Sheng-Yuan Liu; Yu-Nung Su; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 847巻, 2号, 掲載ページ id. 108, 出版日 2017年10月, 査読付
研究論文（学術雑誌）, 英語 - On-Wafer Capacitance Measurement of Nb-Based SIS Junctions with a 4-K Probe Station
Takafumi Kojima; Matthias Kroug; Konomi Sato; Takeshi Sakai; Yoshinori Uzawa
IEEE Transactions on Applied Superconductivity, 27巻, 4号, 出版日 2017年06月, 査読付
研究論文（学術雑誌） - Vertical structure of the transition zone from infalling rotating envelope to disc in the Class 0 protostar, IRAS 04368+2557
Nami Sakai; Yoko Oya; Aya E. Higuchi; Yuri Aikawa; Tomoyuki Hanawa; Cecilia Ceccarelli; Bertrand Lefloch; Ana Lopez-Sepulcre; Yoshimasa Watanabe; Takeshi Sakai; Tomoya Hirota; Emmanuel Caux; Charlotte Vastel; Claudine Kahane; Satoshi Yamamoto
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 467巻, 1号, 掲載ページ L76-L80, 出版日 2017年05月, 査読付
研究論文（学術雑誌）, 英語 - L483: Warm Carbon-chain Chemistry Source Harboring Hot Corino Activity
Yoko Oya; Nami Sakai; Yoshimasa Watanabe; Aya E. Higuchi; Tomoya Hirota; Ana Lopez-Sepulcre; Takeshi Sakai; Yuri Aikawa; Cecilia Ceccarelli; Bertrand Lefloch; Emmanuel Caux; Charlotte Vastel; Claudine Kahane; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 837巻, 2号, 掲載ページ id. 174, 出版日 2017年03月, 査読付
研究論文（学術雑誌）, 英語 - Low Leakage Current Nb-Based Tunnel Junctions with an Extra Top Al Layer
Mizuki Ikeya; Takashi Noguchi; Takafumi Kojima; Takeshi Sakai
IEICE TRANSACTIONS ON ELECTRONICS, E100C巻, 3号, 掲載ページ 291-297, 出版日 2017年03月, 査読付
研究論文（学術雑誌）, 英語 - Astrochemical Properties of Planck Cold Clumps
Ken'ichi Tatematsu; Tie Liu; Satoshi Ohashi; Patricio Sanhueza; Quang Nguyen Luong; Tomoya Hirota; Sheng-Yuan Liu; Naomi Hirano; Minho Choi; Miju Kang; Mark A. Thompson; Gary Fuller; Yuefang Wu; Di Li; James Di Francesco; Kee-Tae Kim; Ke Wang; Isabelle Ristorcelli; Mika Juvela; Hiroko Shinnaga; Maria Cunningham; Masao Saito; Jeong-Eun Lee; L. Viktor Toth; Jinhua He; Takeshi Sakai; Jungha Kim
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 228巻, 2号, 掲載ページ id. 20, 出版日 2017年02月, 査読付
研究論文（学術雑誌）, 英語 - Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557
Nami Sakai; Yoko Oya; Aya E. Higuchi; Yuri Aikawa; Tomoyuki Hanawa; Cecilia Ceccarelli; B. Lefloch; Ana López-Sepulcre; Yoshimasa Watanabe; Takeshi Sakai; Tomoya Hirota; Emmanuel Caux; Charlotte Vastel; Claudine Kahane; Satoshi Yamamoto
Monthly Notices of the Royal Astronomical Society: Letters, Oxford University Press (OUP), 掲載ページ slx002-slx002, 出版日 2017年01月13日, 査読付
研究論文（学術雑誌） - DISCOVERY OF A HOT CORINO IN THE BOK GLOBULE B335
Muneaki Imai; Nami Sakai; Yoko Oya; Ana Lopez-Sepulcre; Yoshimasa Watanabe; Cecilia Ceccarelli; Bertrand Lefloch; Emmanuel Caux; Charlotte Vastel; Claudine Kahane; Takeshi Sakai; Tomoya Hirota; Yuri Aikawa; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 830巻, 2号, 掲載ページ id. L37, 出版日 2016年10月, 査読付
研究論文（学術雑誌）, 英語 - SUBARCSECOND ANALYSIS OF THE INFALLING-ROTATING ENVELOPE AROUND THE CLASS I PROTOSTAR IRAS 04365+2535
Nami Sakai; Yoko Oya; Ana Lopez-Sepulcre; Yoshimasa Watanabe; Takeshi Sakai; Tomoya Hirota; Yuri Aikawa; Cecilia Ceccarelli; Bertrand Lefloch; Emmanuel Caux; Charlotte Vastel; Claudine Kahane; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 820巻, 2号, 掲載ページ id. L34, 出版日 2016年04月, 査読付
研究論文（学術雑誌）, 英語 - THE DEUTERIUM FRACTION IN MASSIVE STARLESS CORES AND DYNAMICAL IMPLICATIONS
Shuo Kong; Jonathan C. Tan; Paola Caselli; Francesco Fontani; Thushara Pillai; Michael J. Butler; Yoshito Shimajiri; Fumitaka Nakamura; Takeshi Sakai
ASTROPHYSICAL JOURNAL, 821巻, 2号, 掲載ページ id. 94, 出版日 2016年04月, 査読付
研究論文（学術雑誌）, 英語 - SPECTRAL-LINE SURVEY AT MILLIMETER AND SUBMILLIMETER WAVELENGTHS TOWARD AN OUTFLOW-SHOCKED REGION, OMC 2-FIR 4
Shimajiri Yoshito; Sakai Takeshi; Kitamura Yoshimi; Tsukagoshi Takashi; Saito Masao; Nakamura Fumitaka; Momose Munetake; Takakuwa Shigehisa; Yamaguchi Takahiro; Sakai Nami; Yamamoto Satoshi; Kawabe Ryohei
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 221巻, 2号, 出版日 2015年12月, 査読付 - Hierarchical fragmentation and collapse signatures in a high-mass starless region
H. Beuther; Th. Henning; H. Linz; S. Feng; S. E. Ragan; R. J. Smith; S. Bihr; T. Sakai; R. Kuiper
ASTRONOMY & ASTROPHYSICS, 581巻, 掲載ページ id.A119, 出版日 2015年09月, 査読付
研究論文（学術雑誌）, 英語 - SPECTRAL LINE SURVEY TOWARD THE YOUNG MASSIVE PROTOSTAR NGC 2264 CMM3 IN THE 4 mm, 3 mm, AND 0.8mm BANDS
Yoshimasa Watanabe; Nami Sakai; Ana Lopez-Sepulcre; Ryuta Furuya; Takeshi Sakai; Tomoya Hirota; Sheng-Yuan Liu; Yu-Nung Su; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 809巻, 2号, 掲載ページ id. 162, 出版日 2015年08月, 査読付
研究論文（学術雑誌）, 英語 - ALMA OBSERVATIONS OF THE IRDC CLUMP G34.43+00.24 MM3: DNC/HNC RATIO
Takeshi Sakai; Nami Sakai; Kenji Furuya; Yuri Aikawa; Tomoya Hirota; Jonathan B. Foster; Patricio Sanhueza; James M. Jackson; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 803巻, 2号, 掲載ページ id. 70, 出版日 2015年04月, 査読付
研究論文（学術雑誌）, 英語 - Submillimeter-Wave Observations toward the Low-Mass Protostar IRAS 15398-3359 at Subarcsecond Resolution
Oya Yoko; Sakai Nami; Watanabe Yoshimasa; Yamamoto Satoshi; Sakai Takeshi; Hirota Tomoya; Lindberg Johan E; Bisschop Suzannne E; Jorgensen Jes K; van Dishoeck Ewine F
REVOLUTION IN ASTRONOMY WITH ALMA: THE THIRD YEAR, 499巻, 掲載ページ 221-222, 出版日 2015年, 査読付 - Low-noise 1.5 THz waveguide-type hot-electron bolometer mixers using relatively thick NbTiN superconducting film
Shiino T; Furuya R; Soma T; Watanabe Y; Sakai T; Jiang L; Maezawa H; Yamakura T; Sakai N; Yamamoto S
Japanese Journal of Applied Physics, 54巻, 3号, 出版日 2015年, 査読付
研究論文（学術雑誌）, 英語 - DENSE MOLECULAR CLUMPS ASSOCIATED WITH THE LARGE MAGELLANIC CLOUD SUPERGIANT SHELLS LMC 4 AND LMC 5
Kosuke Fujii; Tetsuhiro Minamidani; Norikazu Mizuno; Toshikazu Onishi; Akiko Kawamura; Erik Muller; Joanne Dawson; Ken'ichi Tatematsu; Tetsuo Hasegawa; Tomoka Tosaki; Rie E. Miura; Kazuyuki Muraoka; Takeshi Sakai; Takashi Tsukagoshi; Kunihiko Tanaka; Hajime Ezawa; Yasuo Fukui
ASTROPHYSICAL JOURNAL, 796巻, 2号, 掲載ページ id. 123, 出版日 2014年12月, 査読付
研究論文（学術雑誌）, 英語 - A Substellar-mass Protostar and its Outflow of IRAS 15398–3359 Revealed by Subarcsecond-resolution Observations of H2CO and CCH
Oya, Y; Sakai, N; Sakai, T; Watanabe, Y; Hirota, T; Lindberg, J. E; Bisschop, S. E; Jørgensen, J. K; van Dishoeck; E. F; Yamamoto, S
The Astrophysical Journal, 795巻, 2号, 掲載ページ id. 152, 出版日 2014年11月, 査読付
研究論文（学術雑誌）, 英語 - ALMA OBSERVATIONS OF THE IRDC CLUMP G34.43+00.24 MM3: 278 GHz CLASS I METHANOL MASERS
Takahiro Yanagida; Takeshi Sakai; Tomoya Hirota; Nami Sakai; Jonathan B. Foster; Patricio Sanhueza; James M. Jackson; Kenji Furuya; Yuri Aikawa; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 794巻, 1号, 掲載ページ id. L10, 出版日 2014年10月, 査読付
研究論文（学術雑誌）, 英語 - DISTRIBUTED LOW-MASS STAR FORMATION IN THE IRDC G34.43+00.24
Jonathan B. Foster; Hector G. Arce; Marc Kassis; Patricio Sanhueza; James M. Jackson; Susanna C. Finn; Stella Offner; Takeshi Sakai; Nami Sakai; Satoshi Yamamoto; Andres E. Guzman; Jill M. Rathborne
ASTROPHYSICAL JOURNAL, 791巻, 2号, 掲載ページ id. 108, 出版日 2014年08月, 査読付
研究論文（学術雑誌）, 英語 - A CHEMICAL VIEW OF PROTOSTELLAR-DISK FORMATION IN L1527
Nami Sakai; Yoko Oya; Takeshi Sakai; Yoshimasa Watanabe; Tomoya Hirota; Cecilia Ceccarelli; Claudine Kahane; Ana Lopez-Sepulcre; Bertrand Lefloch; Charlotte Vastel; Sandrine Bottinelli; Emmanuel Caux; Audrey Coutens; Yuri Aikawa; Shigehisa Takakuwa; Nagayoshi Ohashi; Hsi-Wei Yen; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 791巻, 2号, 掲載ページ id. L38, 出版日 2014年08月, 査読付
研究論文（学術雑誌）, 英語 - DNC/HNC and N2D+/N2H+ ratios in high-mass star-forming cores
F. Fontani; T. Sakai; K. Furuya; N. Sakai; Y. Aikawa; S. Yamamoto
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 440巻, 1号, 掲載ページ 448-456, 出版日 2014年05月, 査読付
研究論文（学術雑誌）, 英語 - Kinematic structure of massive star-forming regions I. Accretion along filaments
J. Tackenberg; H. Beuther; Th Henning; H. Linz; T. Sakai; S. E. Ragan; O. Krause; M. Nielbock; M. Hennemann; J. Pitann; A. Schmiedeke
ASTRONOMY & ASTROPHYSICS, 565巻, 掲載ページ id. A101, 出版日 2014年05月, 査読付
研究論文（学術雑誌）, 英語 - Change in the chemical composition of infalling gas forming a disk around a protostar
Nami Sakai; Takeshi Sakai; Tomoya Hirota; Yoshimasa Watanabe; Cecilia Ceccarelli; Claudine Kahane; Sandrine Bottinelli; Emmanuel Caux; Karine Demyk; Charlotte Vastel; Audrey Coutens; Vianney Taquet; Nagayoshi Ohashi; Shigehisa Takakuwa; Hsi-Wei Yen; Yuri Aikawa; Satoshi Yamamoto
NATURE, 507巻, 7490号, 掲載ページ 78-+, 出版日 2014年03月, 査読付
研究論文（学術雑誌）, 英語 - Anomalous 13C isotope abundances in C3S and C 4H observed toward the cold interstellar cloud, taurus molecular cloud-1
Nami Sakai; Shuro Takano; Takeshi Sakai; Shoichi Shiba; Yoshihiro Sumiyoshi; Yasuki Endo; Satoshi Yamamoto
Journal of Physical Chemistry A, 117巻, 39号, 掲載ページ 9831-9839, 出版日 2013年10月03日, 査読付
研究論文（学術雑誌）, 英語 - Extensive [C I] Mapping toward the orion-a giant molecular cloud
Yoshito Shimajiri; Takeshi Sakai; Takashi Tsukagoshi; Yoshimi Kitamura; Munetake Momose; Masao Saito; Tai Oshima; Kotaro Kohno; Ryohei Kawabe
Astrophysical Journal Letters, 774巻, 2号, 掲載ページ L20, 出版日 2013年09月10日, 査読付
研究論文（学術雑誌）, 英語 - ALMA OBSERVATIONS OF THE IRDC CLUMP G34.43+00.24 MM3: HOT CORE AND MOLECULAR OUTFLOWS
Takeshi Sakai; Nami Sakai; Jonathan B. Foster; Patricio Sanhueza; James M. Jackson; Marc Kassis; Kenji Furuya; Yuri Aikawa; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 775巻, 1号, 掲載ページ L31, 出版日 2013年09月, 査読付
研究論文（学術雑誌）, 英語 - Fragmentation and dynamical collapse of the starless high-mass star-forming region IRDC 18310-4
H. Beuther; H. Linz; J. Tackenberg; Th. Henning; O. Krause; S. Ragan; M. Nielbock; R. Launhardt; S. Bihr; A. Schmiedeke; R. Smith; T. Sakai
ASTRONOMY & ASTROPHYSICS, 553巻, 掲載ページ id, A115, 出版日 2013年05月, 査読付
研究論文（学術雑誌）, 英語 - A New 100-GHz Band Two-Beam Sideband-Separating SIS Receiver for Z-Machine on the NRO 45-m Radio Telescope
T. Nakajima; K. Kimura; A. Nishimura; H. Iwashita; C. Miyazawa; T. Sakai; D. Iono; K. Kohno; R. Kawabe; N. Kuno; H. Ogawa; S. Asayama; T. Tamura; T. Noguchi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 125巻, 925号, 掲載ページ 252-262, 出版日 2013年03月, 査読付
研究論文（学術雑誌）, 英語 - Nobeyama 45m Telescope Legacy Project: Line Survey
S. Takano; Y. Aikawa; V. Chen; N. Hirano; T. Hirota; K. Kamegai; K. Kobayashi; K. Kohno; Y-J. Kuan; S. -Y. Liu; T. Nakajima; N. Ohashi; M. Ohishi; H. Ozeki; N. Sakai; T. Sakai; S. Shiba; Y. -N. Su; M. Sugimura; S. Takakuwa; T. Umemoto; K. -S. Wang; Y. Watanabe; M. Yamada; T. Yamaguchi; S. Yamamoto; Q. -Z. Zhang
NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY, 476巻, 掲載ページ 193-196, 出版日 2013年, 査読付
研究論文（国際会議プロシーディングス）, 英語 - Test Observations of a New 100 GHz Wave-Band FOur-beam REceiver System on the Nobeyama 45-m Telescope (FOREST)
Kazuyuki Muraoka; Kana Matsui; Toshiya Akashi; Nario Kuno; Hiroyuki Iwashita; Chieko Miyazawa; Makoto Koyano; Hiroyuki Baji; Jun Maekawa; Taku Nakajima; Sachiko Onodera; Takeshi Sakai; Kimihiro Kimura; Hiroyuki Maezawa; Toshikazu Onishi; Hideo Ogawa
NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY, 476巻, 掲載ページ 417-418, 出版日 2013年
研究論文（国際会議プロシーディングス）, 英語 - The 0.9 and 1.3 THz Superconducting HEB Mixer Receiver for the ASTE 10 m Telescope
Shiino T; Furuya R; Soma T; Sakai T; Watanabe Y; Sakai N; Jiang L; Ohguchi O; Maezawa H; Yamakura T; Yamamoto S; Kuno N
New Trends in Radio Astronomy in the ALMA Era: The 30th Anniversary of Nobeyama Radio Observatory, 出版日 2013年, 査読付 - Observations of Deuterated Species toward Low-Mass Prestellar and Protostellar Cores
Nishimura Yuri; Sakai Nami; Watanabe Yoshimasa; Sakai Takeshi; Hirota Tomoya; Yamamoto Satoshi
NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY, 476巻, 掲載ページ 343-344, 出版日 2013年, 査読付 - Spectral-Line Survey at Millimeter and Submillimeter Wavelengths toward an Outflow-Shocked Region, OMC2-FIR 4
Yoshito Shimajiri; T. Sakai; Y. Kitamura; T. Tsukagoshi; M. Saito; F. Nakamura; M. Momose; R. Kawabe
NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY, 476巻, 2号, 掲載ページ 341-342, 出版日 2013年, 査読付
研究論文（国際会議プロシーディングス）, 英語 - TENTATIVE DETECTION OF DEUTERATED METHANE TOWARD THE LOW-MASS PROTOSTAR IRAS 04368+2557 IN L1527
Nami Sakai; Yancy L. Shirley; Takeshi Sakai; Tomoya Hirota; Yoshimasa Watanabe; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 758巻, 1号, 掲載ページ id. L4, 出版日 2012年10月, 査読付
研究論文（学術雑誌）, 英語 - CH radio emission from Heiles Cloud 2 as a tracer of molecular cloud evolution
N. Sakai; H. Maezawa; T. Sakai; K. M. Menten; S. Yamamoto
ASTRONOMY & ASTROPHYSICS, 546巻, 掲載ページ id. A103, 出版日 2012年10月, 査読付
研究論文（学術雑誌）, 英語 - Extremely Strong (CO)-C-13 J=3 -> 2 Line in the "Water Fountain" IRAS 16342-3814: Evidence for the Hot-Bottom Burning
Hiroshi Imai; Sze Ning Chong; Jin-Hua He; Jun-ichi Nakashima; Chih-Hao Hsia; Takeshi Sakai; Shuji Deguchi; Nico Koning
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 64巻, 5号, 掲載ページ No. 5, 出版日 2012年10月, 査読付
研究論文（学術雑誌）, 英語 - The 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region. I. Data
Takahiro Yamaguchi; Shuro Takano; Yoshimasa Watanabe; Nami Sakai; Takeshi Sakai; Sheng-Yuan Liu; Yu-Nung Su; Naomi Hirano; Shigehisa Takakuwa; Yuri Aikawa; Hideko Nomura; Satoshi Yamamoto
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 64巻, 5号, 掲載ページ A105, 出版日 2012年10月, 査読付
研究論文（学術雑誌）, 英語 - Initial Results from Nobeyama Molecular Gas Observations of Distant Bright Galaxies
lONO Daisuke; HATSUKADE Bunyo; KOHNO Kotaro; KAWABE Ryohei; IKARASHI Soh; ICHIKAWA Kohei; KODAMA Tadayuki; MOTOHARA Kentaro; NAKAJIMA Taku; NAKANISHI Koichiro; OHTA Kouji; OTA Kazuaki; SAITO Toshiki; SUZUKI Kenta; TADAKI Ken-ichi; TAMURA Yoichi; UEDA Junko; UMEHATA Hideki; YABE Kiyoto; YOSHIDA Tessei; YUMA Suraphong; KUNO Nario; TAKANO Shuro; IWASHITA Hiroyuki; HANDA Kazuyuki; HIGUCHI Aya; HIROTA Akihiko; ISHIKAWA Shinichi; KIMURA Kimihiro; MAEKAWA Jun; MIKOSHIBA Hiroshi; MIYAZAWA Chieko; MIYAZAWA Kazuhiko; MURAOKA Kazuyuki; OGAWA Hideo; ONODERA Sachiko; SAITO Yasufumi; SAKAI Takeshi; TAKAHASHI Shigeru; YUN Min S.
PASJ : publications of the Astronomical Society of Japan, Astronomical Society of Japan, 64巻, 4号, 掲載ページ "L2-1"-"L2-4", 出版日 2012年08月25日, 査読付
研究論文（学術雑誌）, 英語 - DISTRIBUTION OF CH3OH IN NGC 1333 IRAS4B
Nami Sakai; Cecilia Ceccarelli; Sandrine Bottinelli; Takeshi Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 754巻, 1号, 掲載ページ id. 70, 出版日 2012年07月, 査読付
研究論文（学術雑誌）, 英語 - DNC/HNC RATIO OF MASSIVE CLUMPS IN EARLY EVOLUTIONARY STAGES OF HIGH-MASS STAR FORMATION
Takeshi Sakai; Nami Sakai; Kenji Furuya; Yuri Aikawa; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 747巻, 2号, 掲載ページ id. 140, 出版日 2012年03月, 査読付
研究論文（学術雑誌）, 英語 - The onset of high-mass star formation in the direct vicinity of the Galactic mini-starburst W43
H. Beuther; J. Tackenberg; H. Linz; Th. Henning; O. Krause; S. Ragan; M. Nielbock; R. Launhardt; A. Schmiedeke; F. Schuller; P. Carlhoff; Q. Nguyen-Luong; T. Sakai
ASTRONOMY & ASTROPHYSICS, 538巻, 掲載ページ A11, 出版日 2012年02月, 査読付
研究論文（学術雑誌）, 英語 - Development of a new multi-beam array 2SB receiver in 100 GHz band for the NRO 45-m radio telescope
T. Nakajima; K. Kimura; T. Katase; M. Koyano; H. Inoue; T. Sakai; H. Iwashita; C. Miyazawa; S. Asayama; N. Kuno; H. Ogawa; T. Onishi; R. Kawabe; T. Noguchi
23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012, 掲載ページ 100-103, 出版日 2012年
研究論文（国際会議プロシーディングス）, 英語 - Detection of Phosphorus Nitride in the Lynds 1157 B1 Shocked Region
Yamaguchi Takahiro; Takano Shuro; Sakai Nami; Sakai Takeshi; Liu Sheng-Yuan; Su Yu-Nung; Hirano Naomi; Takakuwa Shigehisa; Aikawa Yuri; Nomura Hideko; Yamamoto Satoshi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 63巻, 5号, 掲載ページ L37-L41, 出版日 2011年10月25日, 査読付 - DETECTION OF TWO CARBON-CHAIN-RICH CORES: CB130-3 AND L673-SMM4
Tomoya Hirota; Takeshi Sakai; Nami Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 736巻, 1号, 掲載ページ id. 4, 出版日 2011年07月, 査読付
研究論文（学術雑誌）, 英語 - Early Results of the 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region
Mika Sugimura; Takahiro Yamaguchi; Takeshi Sakai; Tomofumi Umemoto; Nami Sakai; Shuro Takano; Yuri Aikawa; Naomi Hirano; Sheng-Yuan Liu; T. J. Millar; Hideko Nomura; Yu-Nung Su; Shigehisa Takakuwa; Satoshi Yamamoto
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 63巻, 2号, 掲載ページ 459-472, 出版日 2011年04月, 査読付
研究論文（学術雑誌）, 英語 - COMPACT MOLECULAR OUTFLOW FROM NGC 2264 CMM3: A CANDIDATE FOR VERY YOUNG HIGH-MASS PROTOSTAR
Osamu Saruwatari; Nami Sakai; Sheng-Yuan Liu; Yu-Nung Su; Takeshi Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 729巻, 2号, 掲載ページ id. 147, 出版日 2011年03月, 査読付
研究論文（学術雑誌）, 英語 - DENSE CLUMPS IN GIANT MOLECULAR CLOUDS IN THE LARGE MAGELLANIC CLOUD: DENSITY AND TEMPERATURE DERIVED FROM (CO)-C-13(J=3-2) OBSERVATIONS
Tetsuhiro Minamidani; Takanori Tanaka; Yoji Mizuno; Norikazu Mizuno; Akiko Kawamura; Toshikazu Onishi; Tetsuo Hasegawa; Ken'ichi Tatematsu; Tatsuya Takekoshi; Kazuo Sorai; Nayuta Moribe; Kazufumi Torii; Takeshi Sakai; Kazuyuki Muraoka; Kunihiko Tanaka; Hajime Ezawa; Kotaro Kohno; Sungeun Kim; Monica Rubio; Yasuo Fukui
ASTRONOMICAL JOURNAL, 141巻, 3号, 掲載ページ id. 73, 出版日 2011年03月, 査読付
研究論文（学術雑誌）, 英語 - Development of the 1.3-1.5 THz Band Superconducting HEB Mixer Receivers for ASTE 10 M Telescope
T. Shiino; L. Jiang; R. Furuya; T. Yamaguchi; S. Shiba; T. Sakai; N. Sakai; Y. Watanabe; O. Ohguchi; H. Maezawa; T. Yamakura; Y. Irimajiri; S. Yamamoto
22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, International Symposium on Space Terahertz Technology, 掲載ページ 146, 出版日 2011年
研究論文（国際会議プロシーディングス）, 英語 - LINE SURVEY OF L1157 B1 SHOCKED REGION
T. Yamaguchi; M. Sugimura; T. Sakai; N. Sakai; S. Takano; Y. Aikawa; N. Hirano; S. -L. Liu; H. Nomura; Y. -N. Su; S. Takakuwa; S. Yamamoto
CONDITIONS AND IMPACT OF STAR FORMATION: NEW RESULTS WITH HERSCHEL AND BEYOND, 52巻, 掲載ページ 311-+, 出版日 2011年, 査読付
研究論文（国際会議プロシーディングス）, 英語 - DISTRIBUTIONS OF CARBON-CHAIN MOLECULES IN L1527
Nami Sakai; Takeshi Sakai; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 722巻, 2号, 掲載ページ 1633-1643, 出版日 2010年10月, 査読付
研究論文（学術雑誌）, 英語 - LONG CARBON-CHAIN MOLECULES AND THEIR ANIONS IN THE STARLESS CORE, LUPUS-1A
Nami Sakai; Tatsuya Shiino; Tomoya Hirota; Takeshi Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 718巻, 2号, 掲載ページ L49-L52, 出版日 2010年08月, 査読付
研究論文（学術雑誌）, 英語 - A SURVEY OF MOLECULAR LINES TOWARD MASSIVE CLUMPS IN EARLY EVOLUTIONARY STAGES OF HIGH-MASS STAR FORMATION
Takeshi Sakai; Nami Sakai; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 714巻, 2号, 掲載ページ 1658-1671, 出版日 2010年05月, 査読付
研究論文（学術雑誌）, 英語 - Searching for chameleon-like scalar fields with the ammonia method
S. A. Levshakov; P. Molaro; A. V. Lapinov; D. Reimers; C. Henkel; T. Sakai
ASTRONOMY & ASTROPHYSICS, 512巻, 掲載ページ A44, 出版日 2010年03月, 査読付
研究論文（学術雑誌）, 英語 - Abundance anomaly of the C-13 species of CCH
N. Sakai; O. Saruwatari; T. Sakai; S. Takano; S. Yamamoto
ASTRONOMY & ASTROPHYSICS, 512巻, 掲載ページ A31, 出版日 2010年03月, 査読付
研究論文（学術雑誌）, 英語 - Development of the Measurement System of Image Rejection Ratio for the Sideband-Separating Receiver
Taku Nakajima; Takeshi Sakai; Nario Kuno; Hideo Ogawa
Journal of Infrared, Millimeter and Terahertz Waves, 31巻, 2号, 掲載ページ 143-150, 出版日 2010年02月, 査読付
研究論文（学術雑誌）, 英語 - DEUTERATED MOLECULES IN WARM CARBON CHAIN CHEMISTRY: THE L1527 CASE
Nami Sakai; Takeshi Sakai; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 702巻, 2号, 掲載ページ 1025-1035, 出版日 2009年09月, 査読付
研究論文（学術雑誌）, 英語 - A THz SIS mixer with a NbTiN-ground plane and SIS microtrilayers directly grown on a quartz substrate
Akira Endo; Takashi Noguchi; Matthias Kroug; Sergey V. Shitov; Wenlei Shan; Tomonori Tamura; Takafumi Kojima; Yoshinori Uzawa; Takeshi Sakai; Hirofumi Inoue; Kotaro Kohno
IEEE Transactions on Applied Superconductivity, 19巻, 3号, 掲載ページ 400-404, 出版日 2009年06月
研究論文（国際会議プロシーディングス） - Discovery of the Second Warm Carbon-Chain-Chemistry Source, IRAS15398 – 3359 in Lupus
Nami Sakai; Takeshi Sakai; Tomoya Hirota; Michael Burton; Satoshi Yamamoto
The Astrophysical Journal, 697巻, 1号, 掲載ページ 769-786, 出版日 2009年05月, 査読付
研究論文（学術雑誌）, 英語 - New achievements of ASTE: the Atacama Submillimeter Telescope Experiment
Hajime Ezawa; Kotaro Kohno; Ryohei Kawabe; Satoshi Yamamoto; Hirofumi Inoue; Hiroyuki Iwashita; Hiroshi Matsuo; Takeshi Okuda; Tai Oshima; Takeshi Sakai; Kunihiko Tanaka; Nobuyuki Yamaguchi; Grant W. Wilson; Min S. Yun; Itziar Aretxaga; David Hughes; Jason Austermann; Thushara A. Perera; Kimberly S. Scott; Leonardo Bronfman; Juan R. Cortes
Ground-based and Airborne Telescopes II, SPIE, 出版日 2008年08月, 査読付 - ASTE CO (3-2) Observations of the Southern Barred Spiral Galaxy NGC 986 : a Large Gaseous Bar Filled with a Dense Molecular Medium
Kohno Kotaro; Tosaki Tomoka; Miura Rie; MURAOKA Kazuyuki; SAWADA Tsuyoshi; NAKANISHI Kouichiro; KUNO Nario; SAKAI Takeshi; SORAI Kazuo; KAMEGAI Kazuhisa; TANAKA Kunihiko; OKUDA Takeshi; ENDO Akira; HATSUKADE Bunyo; SAMESHIMA Masahiro; EZAWA Hajime; SAKAMOTO Seiichi; KAMAZAKI Takeshi; YAMAGUCHI Nobuyuki; CORTES Juan; TAMURA Yoichi; FUKUHARA Masayuki; IONO Daisuke; KAWABE Ryohei
PASJ : publications of the Astronomical Society of Japan, Astronomical Society of Japan, 60巻, 3号, 掲載ページ 457-464, 出版日 2008年06月25日, 査読付
研究論文（学術雑誌）, 英語 - A new 100-GHz band front-end system with a waveguide-type dual-polarization sideband-separating SIS receiver for the NRO 45-m radio telescope
Taku Nakajima; Takeshi Sakai; Shin'ichiro Asayama; Kimihiro Kimura; Masayuki Kawamura; Yoshinori Yonekura; Hideo Ogawa; Nario Kuno; Takashi Noguchi; Masato Tsuboi; Ryohei Kawabe
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 60巻, 3号, 掲載ページ 435-443, 出版日 2008年06月, 査読付
研究論文（学術雑誌）, 英語 - A molecular line observation toward massive clumps associated with infrared dark clouds
Takeshi Sakai; Nami Sakai; Kazuhisa Kamegai; Tomoya Hirota; Nobuyuki Yamaguchi; Shoichi Shiba; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 678巻, 2号, 掲載ページ 1049-1069, 出版日 2008年05月, 査読付
研究論文（学術雑誌）, 英語 - Detection of HCO2+ toward the low-mass protostar IRAS 04368+2557 in L1527
Nami Sakai; Takeshi Sakai; Yuri Aikawa; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 675巻, 2号, 掲載ページ L89-L92, 出版日 2008年03月, 査読付
研究論文（学術雑誌）, 英語 - 350 GHz sideband separating receiver for ASTE
Hirofumi Inoue; Kazuyuki Muraoka; Takeshi Sakai; Akira Endo; Kotaro Kohno; Shin'ichiro Asayama; Takashi Noguchi; Hideo Ogawa
Proceedings of the 19th International Symposium on Space Terahertz Technology, ISSTT 2008, 掲載ページ 262-266, 出版日 2008年
研究論文（国際会議プロシーディングス）, 英語 - A novel THz SIS mixer with a NbTiN-ground plane and SIS micro-trilayers directly grown on a quartz substrate
Akira Endo; Takashi Noguchi; Matthias Kroug; Sergey V. Shitov; Wenlei Shan; Tomonori Tamura; Takafumi Kojima; Yoshinori Uzawa; Takeshi Sakai; Hirofumi Inoue; Kazuyuki Muraoka; Kotaro Kohno
Proceedings of the 19th International Symposium on Space Terahertz Technology, ISSTT 2008, 掲載ページ 54-59, 出版日 2008年
研究論文（国際会議プロシーディングス） - A possible detection of CO (J=3-2) emission from the host Galaxy of GRB 980425 with the atacama submillimeter telescope experiment
Bunyo Hatsukade; Kotaro Kohno; Akira Endo; Tomoka Tosaki; Kouji Ohta; Seiichi Sakamoto; Nobuyuki Kawai; Juan R. Cortes; Kouichiro Nakanishi; Takeshi Okuda; Kazuyuki Muraoka; Takeshi Sakai; Hajime Ezawa; Nobuyuki Yamaguchi; Kazuhisa Kamegai; Ryohei Kawabe
MAPPING THE GALAXY AND NEARBY GALAXIES, 掲載ページ 331-331, 出版日 2008年, 査読付
研究論文（国際会議プロシーディングス）, 英語 - Tentative detection of C4H- toward the low-mass protostar IRAS 04368+2557 in L1527
Nami Sakai; Takeshi Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL LETTERS, 673巻, 1号, 掲載ページ L71-L74, 出版日 2008年01月, 査読付
研究論文（学術雑誌）, 英語 - Abundant carbon-chain molecules toward the low-mass protostar IRAS 04368+2557 in L1527
Nami Sakai; Takeshi Sakai; Tomoya Hirota; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 672巻, 1号, 掲載ページ 371-381, 出版日 2008年01月, 査読付
研究論文（学術雑誌）, 英語 - Detection of C6H- toward the low-mass protostar IRAS 04368+2557 in L1527
Nami Sakai; Takeshi Sakai; Yoshihiro Osamura; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 667巻, 1号, 掲載ページ L65-L68, 出版日 2007年09月, 査読付
研究論文（学術雑誌）, 英語 - Production pathways of CCS and CCCS inferred from their C-13 isotopic species
Nami Sakai; Masafumi Ikeda; Masaru Morita; Takeshi Sakai; Shuro Takano; Yoshihiro Osamura; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 663巻, 2号, 掲載ページ 1174-1179, 出版日 2007年07月, 査読付
研究論文（学術雑誌）, 英語 - Physical and chemical properties of massive clumps in the AFGL 333 cloud
Takeshi Sakai; Tomoharu Oka; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 662巻, 2号, 掲載ページ 1043-1051, 出版日 2007年06月, 査読付
研究論文（学術雑誌）, 英語 - Methyl formate in the NGC 2264 IRS 1 region
Nami Sakai; Takeshi Sakai; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 660巻, 1号, 掲載ページ 363-369, 出版日 2007年05月, 査読付
研究論文（学術雑誌）, 英語 - A search for CO (J=3-2) emission from the host galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment
Bunyo Hatsukade; Kotaro Kohno; Akira Endo; Tomoka Tosaki; Kouji Ohta; Seiichi Sakamoto; Nobuyuki Kawai; Juan R. Cortes; Kouichiro Nakanishi; Takeshi Okuda; Kazuyuki Muraoka; Takeshi Sakai; Paul M. Vreeswijk; Hajime Ezawa; Nobuyuki Yamaguchi; Kazuhisa Kamegai; Ryohei Kawabe
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 59巻, 1号, 掲載ページ 67-72, 出版日 2007年02月, 査読付
研究論文（学術雑誌）, 英語 - ASTE CO (3-2) observations of the barred spiral galaxy M 83: I. Correlation between CO (3-2)/CO (1-0) ratios and star formation efficiencies
Kazuyuki Muraoka; Kotaro Kohno; Tomoka Tosaki; Nario Kuno; Kouichiro Nakanishi; Kazuo Sorai; Takeshi Okuda; Seiichi Sakamoto; Akira Endo; Bunyo Hatsukade; Kazuhisa Kamegai; Kunihiko Tanaka; Juan Cortes; Hajime Ezawa; Nobuyuki Yamaguchi; Takeshi Sakai; Ryohei Kawabe
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 59巻, 1号, 掲載ページ 43-54, 出版日 2007年02月, 査読付
研究論文（学術雑誌）, 英語 - Atomic carbon in the AFGL 333 cloud
Takeshi Sakai; Tomoharu Oka; Satoshi Yamamoto
ASTROPHYSICAL JOURNAL, 649巻, 1号, 掲載ページ 268-279, 出版日 2006年09月, 査読付
研究論文（学術雑誌）, 英語 - A possible detection of CO (J = 32) emission from the host galaxy of GRB 980425 with atacama submillimeter telescope experiment
Bunyo Hatsukade; Kotaro Kohno; Akira Endo; Tomoka Tosaki; Kouji Ohta; Seiichi Sakamoto; Nobuyuki Kawai; Juan R. Corts; Kouichiro Nakanishi; Takeshi Okuda; Kazuyuki Muraoka; Takeshi Sakai; Hajime Ezawa; Nobuyuki Yamaguchi; Kazuhisa Kamegai; Ryohei Kawabe
Proceedings of the International Astronomical Union, 2巻, 235号, 掲載ページ 312, 出版日 2006年08月
研究論文（国際会議プロシーディングス）, 英語 - Submillimeter-wave CI spectral lines from the NGC 1333 region
T Oka; M Iwata; H Maezawa; M Ikeda; T Ito; K Kamegai; T Sakai; S Yamamoto
ASTROPHYSICAL JOURNAL, 602巻, 2号, 掲載ページ 803-815, 出版日 2004年02月, 査読付
研究論文（学術雑誌）, 英語 - An experimental study of submillimeter-wave horn antennae for a submillimeter-wave array
M Matsunaga; Y Sekmioto; T Matsunaga; T Sakai
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 55巻, 5号, 掲載ページ 1051-1057, 出版日 2003年10月, 査読付
研究論文（学術雑誌）, 英語 - Distribution of the [C I] Emission in the ρ Ophiuchi Dark Cloud
Kazuhisa Kamegai; Masafumi Ikeda; Hiroyuki Maezawa; Tetsuya Ito; Mitsuhiro Iwata; Takeshi Sakai; Tomoharu Oka; Satoshi Yamamoto; Yutaro Sekimoto; Ken’ichi Tatematsu; Takashi Noguchi; Shuji Saito; Hideo Fujiwara; Hiroyuki Ozeki; Junji Inatani; Masatoshi Ohishi
The Astrophysical Journal, 589巻, 1号, 掲載ページ 378-385, 出版日 2003年05月, 査読付
研究論文（学術雑誌）, 英語 - A 350 GHz SIS receiver on the Nobeyama 10 m submillimeter telescope
Y Sekimoto; T Sakai; G Saito; K Takematsu; K Tanaka; K Kohno; T Noguchi; H Iwashita; T Takahashi; N Satou; S Yokogawa; S Sakamoto; N Ukita; R Kawabe; T Ito; H Maezawa; S Yamamoto
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 53巻, 5号, 掲載ページ 951-958, 出版日 2001年10月, 査読付
研究論文（学術雑誌）, 英語 - Atomic carbon and CO isotope emission in the vicinity of DR 15
T Oka; S Yamamoto; M Iwata; H Maezawa; M Ikeda; T Ito; K Kamegai; T Sakai; Y Sekimoto; K Tatematsu; Y Arikawa; Y Aso; T Noguchi; SC Shi; K Miyazawa; S Saito; H Ozeki; H Fujiwara; M Ohishi; J Inatani
ASTROPHYSICAL JOURNAL, 558巻, 1号, 掲載ページ 176-184, 出版日 2001年09月, 査読付
研究論文（学術雑誌）, 英語 - Observation of the C [CSC]i[/CSC] [TSUP]3[/TSUP][ITAL]P[/ITAL][TINF]2[/TINF]–[TSUP]3[/TSUP][ITAL]P[/ITAL][TINF]1[/TINF] Line toward the Orion Kleinmann-Low Region
Satoshi Yamamoto; Hiroyuki Maezawa; Masafumi Ikeda; Tetsuya Ito; Tomoharu Oka; Gaku Saito; Mitsuhiro Iwata; Kazuhisa Kamegai; Takeshi Sakai; Yutaro Sekimoto; Ken’ichi Tatematsu; Takashi Noguchi; Sheng-Cai Shi; Yuji Arikawa; Yoshiyuki Aso; Keisuke Miyazawa; Shuji Saito; Hideo Fujiwara; Masatoshi Ohishi; Hiroyuki Ozeki; Junji Inatani
The Astrophysical Journal, American Astronomical Society, 547巻, 2号, 掲載ページ L165-L169, 出版日 2001年02月01日, 査読付
研究論文（学術雑誌） - Observation of the (CIP2)-P-3-P-3(1) line toward the Orion Kleinmann-Low region
S Yamamoto; H Maezawa; M Ikeda; T Ito; T Oka; G Saito; M Iwata; K Kamegai; T Sakai; Y Sekimoto; K Tatematsu; T Noguchi; SC Shi; Y Arikawa; Y Aso; K Miyazawa; S Saito; H Fujiwara; M Ohishi; H Ozeki; J Inatani
ASTROPHYSICAL JOURNAL, 547巻, 2号, 掲載ページ L165-L169, 出版日 2001年02月, 査読付
研究論文（学術雑誌）, 英語 - <title>Plan of receiver development for ASTE/LMSA</title>
Yutaro Sekimoto; Takeshi Sakai; Gaku Saito; Kotaro Kohno; Hiroyuki Iwashita; Naohisa Satou; Toshikazu Takahashi; Takashi Noguchi; Ryohei Kawabe; Hiroyuki Maezawa; Tetsuya Ito; Satoshi Yamamoto
SPIE Proceedings, SPIE, 出版日 2000年07月03日
研究論文（国際会議プロシーディングス） - The Mt. Fuji submillimeter-wave telescope
Yutaro Sekimoto; Yuji Arikawa; Yoshiyuki Aso; Hideo Fujiwara; Masafumi Ikeda; Junji Inatani; Tetsuya Ito; Mituhiro Iwata; Kazuhisa Kamegai; Hiroyuki Maezawa; Takashi Noguchi; Masatoshi Ohishi; Tomoharu Oka; Hiroyuki Ozeki; Gaku Saito; Shuji Saito; Takeshi Sakai; Sheng-Cai Shi; Ken'ichi Tatematsu; Satoshi Yamamoto
SPIE Proceedings, SPIE, 出版日 2000年07月03日
研究論文（国際会議プロシーディングス） - The Mt. Fuji submillimeter-wave telescope
Y Sekimoto; S Yamamoto; T Oka; M Ikeda; H Maezawa; T Ito; G Saito; M Iwata; K Kamegai; T Sakai; K Tatematsu; Y Arikawa; Y Aso; T Noguchi; K Miyazawa; SC Shi; S Saito; H Ozeki; H Fujiwara; J Inatani; M Ohishi; K Noda; Y Togashi
REVIEW OF SCIENTIFIC INSTRUMENTS, 71巻, 7号, 掲載ページ 2895-2907, 出版日 2000年07月, 査読付
研究論文（学術雑誌）, 英語
MISC
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山崎康正; 長谷川豊; 増井翔; 川下紗奈; 米山翔; 知念翼; 大西利和; 小川英夫; 立松健一; 西村淳; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 小嶋崇文; 今田大皓; 金子慶子; 坂井了; 酒井剛
出版日 2022年, 日本天文学会年会講演予稿集, 2022巻, 1347-0639, 202202264572182868 - 野辺山45m鏡7ビーム3帯域両偏波受信機(7BEE)の開発 XIII
米山翔; 亀山晃; 孫赫陽; 抱江柊利; 野曽原千晟; 川下紗奈; 知念翼; 中尾優花; 松本健; 山崎康正; 増井翔; 長谷川豊; 澤田(佐藤)聡子; 大西利和; 小川英夫; 立松健一; 西村淳; 宮澤千栄子; 高橋敏一; 前川淳; 小嶋崇文; 酒井剛
出版日 2022年, 日本天文学会年会講演予稿集, 2022巻, 1347-0639, 202202269723416378 - 北半球最高感度ミリ波サブミリ波ヘテロダイン受信システムLMT-FINER II.デジタルサイドバンド分離広帯域分光計の性能評価
萩本将都; 田村陽一; 谷口暁星; 中島拓; 中野覚矢; 彦坂拓海; 鎌崎剛; 川邊良平; 吉村勇紀; 廿日出文洋; 酒井剛; 田中邦彦; 川元宏朗; 原田健一; 谷口達
出版日 2022年, 日本天文学会年会講演予稿集, 2022巻, 1347-0639, 202202261350656886 - 北半球最高感度ミリ波サブミリ波ヘテロダイン受信システムLMT-FINER III.遠赤外線微細構造線による前・宇宙再電離期の銀河形成の開拓
田村陽一; 萩本将都; 谷口暁星; 酒井剛; 小嶋崇文; 川邊良平; 河野孝太郎; 廿日出文洋; 吉村勇紀; 田中邦彦; 井上昭雄; 橋本拓也; 竹腰達哉
出版日 2022年, 日本天文学会年会講演予稿集, 2022巻, 1347-0639, 202202228583675505 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 IV:導波管回路
増井翔; 川下紗奈; 米山翔; 山崎康正; 横山航希; 長谷川豊; 大西利和; 小川英夫; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102212245618457 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 I:目的
立松健一; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 金子慶子; 小川英夫; 長谷川豊; 山崎康正; 増井翔; 川下紗奈; 米山翔; 横山航希; 大西利和; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102217169883739 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 III:光学系
山崎康正; 長谷川豊; 増井翔; 川下紗奈; 米山翔; 横山航希; 大西利和; 小川英夫; 木村公洋; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 金子慶子; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102254145232759 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 II:受信機概要
長谷川豊; 山崎康正; 増井翔; 川下紗奈; 米山翔; 横山航希; 小川英夫; 大西利和; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 金子慶子; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102284014897239 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 VII:広帯域直交偏波分離器の設計と評価
米山翔; 増井翔; 川下紗奈; 山崎康正; 長谷川豊; 大西利和; 小川英夫; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; 小嶋崇文; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102218975964099 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 VIII:導波管型Triplexerの設計および評価
川下紗奈; 増井翔; 米山翔; 山崎康正; 長谷川豊; 大西利和; 小川英夫; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; 小嶋崇文; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102246113568251 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 V:受信機開発の進捗 II
長谷川豊; 山崎康正; 増井翔; 川下紗奈; 米山翔; 知念翼; 小川英夫; 大西利和; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 金子慶子; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102250436229715 - 野辺山45m鏡7ビーム3帯域両偏波受信機の開発 VI:誘電体レンズを用いたビーム伝送系の設計及び評価
山崎康正; 長谷川豊; 増井翔; 川下紗奈; 米山翔; 大西利和; 小川英夫; 立松健一; 宮澤千栄子; 高橋敏一; 前川淳; GONZALEZ Alvaro; 小嶋崇文; 今田大皓; 金子慶子; 坂井了; 酒井剛
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102274070401722 - ALMAによる原始連星系天体NGC 2264 CMM3の高分解能観測
柴山良希; 渡邉祥正; 大屋瑶子; 坂井南美; LOPEZ-SEPULCRE Ana; LIU Sheng-Yuan; SU Yu-Nung; ZHANG Yichen; 酒井剛; 廣田朋也; 山本智
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102265644572211 - 放射型分光計SUMIREを用いたメタノール分子同位体種のマイクロ波分光
小山貴裕; 玉内朱美; ZENG Shaoshan; 大野有紀; 渡邉祥正; 酒井剛; 坂井南美
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102211397421445 - LMT50m鏡搭載2mm帯受信機B4Rを用いたOrion-KL領域マッピング観測による分子の存在量比の観測結果報告
米津鉄平; 前澤裕之; 川邊良平; 吉村勇紀; 廿日出文洋; 河野孝太郎; 竹腰達哉; 酒井剛; 田中邦彦; 谷口暁星; 田村陽一; 大島泰; 島尻芳人; HUGHES David; SANCHEZ-ARGUELLES David; GOMEZ-RUIZ Arturo; RODRIGUEZ-MONTOYA Ivan; ZARAGOZA-CARDIEL Javier; COLIN Edgar; CHAVEZ-DAGOSTINO Miguel; ROJAS Sergio; SCHLOERB Peter; SOUCCAR Kamal; YUN Min
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102237719469089 - 大口径望遠鏡による広域マッピング観測:LMT50m望遠鏡搭載2mm帯受信機によるOrion A領域の電波再結合線観測結果及びLST将来サイエンス
吉村勇紀; 川邊良平; 米津鉄平; 前澤裕之; 酒井剛; 田中邦彦; 竹腰達哉; 廿日出文洋; 河野孝太郎; 谷口暁星; 田村陽一; 大島泰; 島尻芳人; HUGHES David; SANCHEZ David; GOMEZ Arturo; RODRIGUEZ Victor; COLIN Edgar; ZARAGOZA Javier; CHAVEZ Miguel; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102239748580222 - 50m大型ミリ波望遠鏡LMT/2mm帯受信機B4RによるOrion-KL領域の試験観測
米津鉄平; 前澤裕之; 川邊良平; 吉村勇紀; 廿日出文洋; 河野孝太郎; 竹腰達哉; 酒井剛; 田中邦彦; 谷口暁星; 田村陽一; 大島泰; 島尻芳人; HUGHES David; SANCHEZ-ARGUELLES David; GOMEZ-RUIZ Arturo; RODRIGUEZ-MONTOYA Ivan; ZARAGOZA-CARDIEL Javier; COLIN Edgar; CHAVEZ-DAGOSTINO Miguel; ROJAS Sergio; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2021年, 日本地球惑星科学連合大会予稿集(Web), 2021巻, 202202212986903468 - 2mm帯受信機B4R/LMT50m望遠鏡搭載によるOrion-KL領域試験観測の解析報告
米津鉄平; 前澤裕之; 川邊良平; 吉村勇紀; 廿日出文洋; 河野孝太郎; 竹腰達哉; 酒井剛; 田中邦彦; 谷口暁星; 田村陽一; 大島泰; 島尻芳人; HUGHES David; SANCHEZ-ARGUELLES David; GOMEZ-RUIZ Arturo; RODRIGUEZ-MONTOYA Ivan; ZARAGOZA-CARDIEL Javier; COLIN Edgar; CHAVEZ-DAGOSTINO Miguel; ROJAS Sergio; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2021年, 日本天文学会年会講演予稿集, 2021巻, 1347-0639, 202102236006835925 - ALMA ACA and Nobeyama Observations of Two Orion Cores in Deuterated Molecular Lines
Ken’ichi Tatematsu; Tie Liu; Gwanjeong Kim; Hee-Weon Yi; Jeong-Eun Lee; Naomi Hirano; Sheng-Yuan Liu; Satoshi Ohashi; Patricio Sanhueza; James Di Francesco; Neal J. Evans II; Gary A. Fuller; Ryo Kandori; Minho Choi; Miju Kang; Siyi Feng; Tomoya Hirota; Takeshi Sakai; Xing Lu; Quang Nguyên Lu’o’ng; Mark A. Thompson; Yuefang Wu; Di Li; Kee-Tae Kim; Ke Wang; Isabelle Ristorcelli; Mika Juvela; L. Viktor Tóth
American Astronomical Society, 出版日 2020年06月03日, The Astrophysical Journal, 895巻, 2号, 掲載ページ 119-119, 1538-4357 - テラヘルツ受信機のASTE 望遠鏡への搭載実験と実験室における分子分光実験
渡邉祥正; 酒井剛; 坂井南美
出版日 2020年03月20日, 低温科学, 78巻, 掲載ページ 241-251, 日本語, 査読付, 記事・総説・解説・論説等（大学・研究所紀要） - 大型ミリ波望遠鏡LMT50mに搭載した新型2mm帯受信機B4Rによる系内星形成領域の高感度分子輝線観測
吉村勇紀; 川邊良平; 酒井剛; 田中邦彦; 竹腰達哉; 廿日出文洋; 河野孝太郎; 谷口暁星; 田村陽一; 大島泰; HUGHES David; SANCHEZ David; GOMEZ Arturo; RODRIGUEZ Victor; COLIN Edgar; ZARAGOZA Javier; CHAVEZ Miguel; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2020年, 日本天文学会年会講演予稿集, 2020巻, 1347-0639, 202002241338052880 - LMT50m鏡用2ミリ受信機システムの開発と爆発的星形成銀河,巨大ブラックホールの研究 V:科学評価試験
川邊良平; 酒井剛; 田中邦彦; 吉村勇紀; 竹腰達哉; 廿日出文洋; 河野孝太郎; 谷口暁星; 田村陽一; 大島泰; HUGHES David; SANCHEZ-ARGUELLES David; GOMEZ-RUIZ Arturo; RODRIGUEZ-MONTOYA Ivan; ZARAGOZA-CARDIEL Javier; COLIN Edgar; CHAVEZ-DAGOSTINO Miguel; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2020年, 日本天文学会年会講演予稿集, 2020巻, 1347-0639, 202002269487379745 - LMT50m鏡に搭載した2mm帯受信機B4Rによるオリオン分子雲(OMC-1)の高感度分子輝線マッピング観測:デモ科学観測の概要と輝線同定
川邊良平; 吉村勇紀; 竹腰達哉; 廿日出文洋; 河野孝太郎; 酒井剛; 田中邦彦; 谷口暁星; 田村陽一; 大島泰; 島尻芳人; 前澤裕之; 米津鉄平; HUGHES David; SANCHEZ-ARGUELLES David; GOMEZ-RUIZ Arturo; RODRIGUEZ-MONTOYA Ivan; ZARAGOZA-CARDIEL Javier; COLIN Edgar; CHAVEZ-DAGOSTINO Miguel; SCHLOERB Pete; SOUCCAR Kamal; YUN Min
出版日 2020年, 日本天文学会年会講演予稿集, 2020巻, 1347-0639, 202002277035845603 - 野辺山Planckプロジェクト (1) 概要
立松健一; KIM Gwanjeong; LIU Tie; YI Heeweon; LEE Jeong-Eun; 大橋聡史; 平野尚美; LIU Sheng-Yuan; SANHUEZA Patricio; FENG Siyi; 神鳥亮; CHOI Minho; KANG Miju; 廣田朋也; 酒井剛; LU Xing
出版日 2019年, 日本天文学会年会講演予稿集, 2019巻, 1347-0639, 201902217531928928 - LMT 50m鏡用2ミリ受信機システムの開発と爆発的星形成銀河,巨大ブラックホールの研究 IV 搭載試験観測
酒井剛; 川邊良平; 大島泰; 谷口暁星; 上田哲太朗; 田村陽一; 田中邦彦; 吉村勇紀; 廿日出文洋; 河野孝太郎; HUGHES David; GALE David; SANCHEZ David; GOMEZ-RUIZ Arturo; COLIN Edgar
出版日 2019年, 日本天文学会年会講演予稿集, 2019巻, 1347-0639, 201902213945781100 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:VII.輝線埋め込みシミュレーションと天体信号による総合性能評価
谷口暁星; 田村陽一; 河野孝太郎; 高橋茂; 畳谷仁男; 前川淳; 堀込治; 酒井剛
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802241705597039 - 星の誕生の瞬間に非常に近い二つのオリオンコアのALMA ACA(アタカマコンタクトアレイ)7mアンテナ観測
立松健一; LIU Tie; LIU Tie; YI Heeweon; LEE Jeong-Eun; 大橋聡史; 平野尚美; LIU Sheng-Yuan; SANHUEZA Patricio; FENG Siyi; 神鳥亮; CHOI Minho; KANG Miju; 廣田朋也; 酒井剛; LU Xing
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802279535088381 - 星の誕生の瞬間に非常に近い二つのオリオンコアのALMA ACA7m観測(2)
立松健一; LIU Tie; LIU Tie; KIM Gwanjeong; YI Heeweon; LEE Jeong-Eun; 大橋聡史; 平野尚美; LIU Sheng-Yuan; SANHUEZA Patricio; FENG Siyi; 神鳥亮; CHOI Minho; KANG Miju; 廣田朋也; 酒井剛; LU Xing
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802285723726185 - サブミリ波帯実験室分子分光計の開発と初期成果
千葉雄太郎; 千葉雄太郎; 坂井南美; 海老澤勇治; 山本智; 吉田健人; 吉田健人; 渡邉祥正; 酒井剛
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802272763397970 - 分子雲コアL1544中心領域における重窒素の希釈
古家健次; 渡邉祥正; 酒井剛; 相川祐理; 山本智
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802222491199057 - ALMAを用いたベルセウス座における原始星源の不偏的化学サーベイ
樋口あや; 坂井南美; ZHANG Yichen; 大屋瑶子; 山本智; 渡邉祥正; 酒井剛
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802262282572095 - LMT50m鏡用2ミリ受信機システムの開発と爆発的星形成銀河,巨大ブラックホールの研究 III 搭載計画
川邊良平; 酒井剛; 田中邦彦; 廿日出文洋; 河野孝太郎; 田村陽一; 大島泰; 野口卓; 高橋敏一
出版日 2018年, 日本天文学会年会講演予稿集, 2018巻, 1347-0639, 201802235369007294 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:V.ASTEへのFMLOシステムの搭載・試験観測
谷口暁星; 田村陽一; 河野孝太郎; 畳谷仁男; 高橋茂; 前川淳; 堀込治; 酒井剛
出版日 2017年, 日本天文学会年会講演予稿集, 2017巻, 1347-0639, 201702255002684235 - オリオン座領域のPlanck cold clumpsの化学的進化census
立松健一; LIU Tie; Y Heeweon; LEE Jeong-Eun; 大橋聡史; 平野尚美; LIU Sheng-Yuan; SANHUEZA Patricio; CHOI Minho; KANG Miju; 廣田朋也; 酒井剛; LU Xing
出版日 2017年, 日本天文学会年会講演予稿集, 2017巻, 1347-0639, 201702299836879964 - テラヘルツ帯実験室分子分光計の開発
千葉雄太郎; 坂井南美; 海老澤勇治; 吉田健人; 渡辺祥正; 山本智; 酒井剛
出版日 2017年, 日本天文学会年会講演予稿集, 2017巻, 1347-0639, 201702274605158580 - LMT50m鏡用2mm受信機システムと爆発的星形成銀河,巨大ブラックホールの研究 III:開発進捗
酒井剛; 川邊良平; 田中邦彦; 田村陽一; 河野孝太郎; 大島泰; 廿日出文洋; 野口卓; 高橋敏一
出版日 2017年, 日本天文学会年会講演予稿集, 2017巻, 1347-0639, 201702239925194947 - LMT50m鏡用2mm受信機システムの開発と爆発的星形成銀河,巨大ブラックホールの研究 II:全体進捗
川邊良平; 酒井剛; 田中邦彦; 田村陽一; 河野孝太郎; 大島泰; 野口卓; 高橋敏一; 廿日出文洋
出版日 2017年, 日本天文学会年会講演予稿集, 2017巻, 1347-0639, 201702248011447018 - ASTE10m電波望遠鏡THz受信機の開発と搭載
相馬達也; 渡邉祥正; 吉田健人; 海老澤勇治; 西村優里; LOPEZ-SEPULCRE Ana; 大口脩; 酒井剛; 小嶋崇文; GONZALEZ Alvaro; 坂井南美; 山本智
出版日 2016年, 日本天文学会年会講演予稿集, 2016巻, 1347-0639, 201602212961145001 - 野辺山45m望遠鏡を用いた低温大質量クランプに対する分子輝線サーベイ
酒井剛; 古家健次; 相川祐理; 坂井南美; 廣田朋也; 渡邉祥正; 山本智
出版日 2016年, 日本天文学会年会講演予稿集, 2016巻, 1347-0639, 201602217836710500 - NGC2264CMM3におけるALMAを用いた高空間分解能観測
渡邉祥正; 坂井南美; 酒井剛; 廣田朋也; 山本智
出版日 2016年, 日本天文学会年会講演予稿集, 2016巻, 1347-0639, 201602256161277760 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:IV.野辺山45m望遠鏡での性能評価試験
谷口暁星; 田村陽一; 河野孝太郎; 畳谷仁男; 高橋茂; 前川淳; 久野成夫; 堀込治; 酒井剛
出版日 2015年, 日本天文学会年会講演予稿集, 2015巻, 1347-0639, 201502207141300299 - LMT50m鏡用2ミリ受信機システムと爆発的星形成銀河,巨大ブラックホールの研究
川邊良平; 酒井剛; 田村陽一; 河野孝太郎; 徂徠和夫; 松原英雄; 奥村幸子; 大西利和; 大島泰; 野口卓; 高橋敏一
出版日 2015年, 日本天文学会年会講演予稿集, 2015巻, 1347-0639, 201502209835637731 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:III.地球大気輝線放射-天体信号の分離方法の開発
谷口暁星; 田村陽一; 河野孝太郎; 畳谷仁男; 高橋茂; 前川淳; 久野成夫; 堀込治; 酒井剛
出版日 2014年, 日本天文学会年会講演予稿集, 2014巻, 1347-0639, 201402270786624966 - 若い大質量原始星NGC 2264 CMM3における0.8mm帯分子輝線サーベイ
渡邉祥正; 古屋隆太; 坂井南美; 山本智; 酒井剛
出版日 2014年, 日本天文学会年会講演予稿集, 2014巻, 1347-0639, 201402245462962988 - 若い大質量原始星NGC 2264 CMM3における70GHz帯分子輝線サーベイ
渡邉祥正; 坂井南美; 山本智; 酒井剛; 廣田朋也
出版日 2014年, 日本天文学会年会講演予稿集, 2014巻, 1347-0639, 201402218071388821 - 若い原始星に付随するエンベロープおよびアウトフローのモデル解析
大星瑶子; 坂井南美; 渡邉祥正; 山本智; 酒井剛; 廣田朋也
出版日 2014年, 日本天文学会年会講演予稿集, 2014巻, 1347-0639, 201402240378495868 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:II.野辺山45m望遠鏡における周波数変調受信システムの開発
田村陽一; 谷口暁星; 河野孝太郎; 畳谷仁男; 高橋茂; 前川淳; 久野成夫; 堀込治; 酒井剛
出版日 2013年, 日本天文学会年会講演予稿集, 2013巻, 1347-0639, 201302258912489746 - 周波数変調局部発振器による新しいミリ波サブミリ波分光法:I.受信システムの開発
田村陽一; 畳谷仁男; 高橋茂; 前川淳; 堀込治; 阿部勝己; 河野孝太郎; 酒井剛
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202212743375313 - 小マゼラン雲中の巨大分子雲に対するミリ波・サブミリ波CO輝線観測
南谷哲宏; 木澤淳基; 大西利和; 水野範和; 河村晶子; MULLER Erik; 長谷川哲夫; 立松健一; 酒井剛; 塚越崇; 福井康雄
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202228910830382 - 暗い分子雲コアにおけるCO2の気相生成
徳留智矢; 坂井南美; 酒井剛; 渡邉祥正; 山本智
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202230109564772 - NGC2264 CMM3で見られるクランプへの継続的な乱流供給
古屋隆太; 渡邉祥正; 坂井南美; 酒井剛; 山本智
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202264972938500 - L1157 B1衝撃波領域のラインサーベイ II
山口貴弘; 高野秀路; 酒井剛; 坂井南美; 渡邉祥正; 山本智
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202271121143454 - 星なしコアTMC-1,Lupus1-Aにおける重水素濃縮度
西村優里; 坂井南美; 渡邉祥正; 酒井剛; 廣田朋也; 山本智
出版日 2012年, 日本天文学会年会講演予稿集, 2012巻, 1347-0639, 201202249847473156 - Band 8 QM受信機のASTE望遠鏡への搭載
酒井剛; 塚越崇; 井上裕文; 河野孝太郎; 山本智; 岩下浩幸; 田村陽一; 廿日出文洋; 島尻芳人; 大島泰; 川辺良平; 佐藤直久; 飯塚吉三; 関本裕太郎; 田村友範; 野口卓; 小笠原隆亮
出版日 2011年, 日本天文学会年会講演予稿集, 2011巻, 1347-0639, 201102238528822874 - 野辺山45m望遠鏡用70GHz帯受信機の開発
酒井剛; 柴田大輝; 渡辺祥正; 坂井南美; 山本智; 河野孝太郎; 藤井由美; 野口卓; 浅山信一郎; 中島拓; 廣田朋也; 高野秀路; 木村公洋; 前澤裕之
出版日 2011年, 日本天文学会年会講演予稿集, 2011巻, 1347-0639, 201102283893375653 - L1157 B1衝撃波領域のラインサーベイ
山口貴弘; 高野秀路; 酒井剛; 坂井南美; 渡邉祥正; 山本智
出版日 2011年, 日本天文学会年会講演予稿集, 2011巻, 1347-0639, 201102211327530110 - 大質量星形成領域NGC2264 CMM3のマッピング観測
古屋隆太; 渡邉祥正; 坂井南美; 酒井剛; 山本智
出版日 2011年, 日本天文学会年会講演予稿集, 2011巻, 1347-0639, 201102273065514814 - Detection of HCO2+ toward the low-mass protostar IRAS 04368+2557 in L1527 (vol 675, pg L89, 2008)
Nami Sakai; Takeshi Sakai; Yuri Aikawa; Satoshi Yamamoto
出版日 2008年04月, ASTROPHYSICAL JOURNAL LETTERS, 677巻, 1号, 掲載ページ L75-L75, 英語, その他, WOS:000255237400020 - Development of a Waveguide-Type Dual-polarization Sideband-Separating SIS Receiver System in 100 GHz Band for the NRO 45-m Radio Telescope
Taku Nakajima; Takeshi Sakai; Shin'ichiro Asayama; Kimihiro Kimura; Masayuki Kawamura; Yoshinori Yonekura; Hideo Ogawa; Nario Kuno; Takashi Noguchi; Masato Tsuboi; Ryohei Kawabe
出版日 2008年04月, Proc. of the 19th International Symposium on Space Terahertz Technology, 掲載ページ 286-291, 英語, 速報，短報，研究ノート等（学術雑誌） - ASTE350GHz帯受信機の安定性評価
酒井剛; 関本裕太郎; 立松健一; 河野孝太郎; 野口卓; 田中邦彦; 山本智
出版日 2001年, 日本天文学会年会講演予稿集, 2001巻, 1347-0639, 201402133116006105 - 富士山頂サブミリ波望遠鏡によるOrion KL領域のCI(3P2-3P1;809GHz)輝線の観測
山本智; 前澤裕之; 池田正史; 伊藤哲也; 岡朋治; 斎藤岳; 岩田充弘; 亀谷和久; 酒井剛; 関本裕太郎; 立松健一; 有川裕二; 麻生善之; 野口卓; 史生才; 斎藤修二; 藤原英夫; 大石雅寿; 尾関博之; 稲谷順司
出版日 2000年, 日本天文学会年会講演予稿集, 2000巻, 1347-0639, 201402192447147422 - Plan of receiver development for ASTE/LMSA
Yutaro Sekimoto; Takeshi Sakai; Gaku Saito; Kotaro Kohno; Hiroyuki Iwashita; Naohisa Satou; Toshikazu Takahashi; Takashi Noguchi; Ryohei Kawabe; Hiroyuki Maezawa; Tetsuya Ito; Satoshi Yamamoto
出版日 2000年, Proceedings of SPIE - The International Society for Optical Engineering, 4015巻, 掲載ページ 605-613, 英語, 査読付, 0277-786X, 0033720358, WOS:000089219700063
担当経験のある科目_授業
- 基盤理工学専攻基礎
The University of Electro-Communications - 基盤理工学専攻基礎
電気通信大学 - 電子工学実験第一
The University of Electro-Communications - 電子工学実験第一
電気通信大学 - 電気回路演習
電気通信大学 - 電気回路
The University of Electro-Communications - 力学演習
The University of Electro-Communications - 力学
電気通信大学 - 電気回路演習
The University of Electro-Communications - 電気回路演習
電気通信大学 - 電気回路
電気通信大学 - 電気回路
電気通信大学 - 力学演習
電気通信大学 - 力学演習
電気通信大学 - 力学
The University of Electro-Communications - 力学
電気通信大学 - 電子情報システム実験第一実験
電気通信大学 - 電子情報システム実験第一実験
電気通信大学 - 基礎科学実験A
The University of Electro-Communications - 電子情報システム実験第一
電気通信大学 - 電子情報システム実験第一
The University of Electro-Communications - 電子情報システム実験第一
電気通信大学 - 基礎科学実験A
電気通信大学 - 基礎科学実験A
電気通信大学
共同研究・競争的資金等の研究課題
- 同位体観測で探る星間有機分子の起源と進化：太陽系始原物質の理解に向けて
坂井 南美; 小山 貴裕; 酒井 剛; 渡邉 祥正; 楊 燿綸; 小林 かおり; 古家 健次
日本学術振興会, 科学研究費助成事業, 国立研究開発法人理化学研究所, 基盤研究(A), 25H00676
研究期間 2025年04月01日 - 2029年03月31日 - 次世代の天文観測用1.5THz帯IF広帯域HEBミキサの開発と分子分光への応用
酒井 剛
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), 24K00675
研究期間 2024年04月01日 - 2028年03月31日 - 遠赤外線微細構造輝線で切り拓く前・宇宙再電離期の銀河形成
田村 陽一; 井上 昭雄; 酒井 剛; 小嶋 崇文; 河野 孝太郎; 田中 邦彦
日本学術振興会, 科学研究費助成事業, 名古屋大学, 基盤研究(S), 22H04939
研究期間 2022年04月27日 - 2027年03月31日 - 遠赤外線酸素原子輝線の分光観測による前・宇宙再電離期の開拓
研究期間 2022年04月01日 - 2027年03月31日 - 高感度・高分解能観測で探る惑星系形成領域の化学進化
研究期間 2020年11月19日 - 2025年03月31日 - 重水素分子で探る星形成の極初期
研究期間 2020年 - 2025年03月31日 - ALMAで探る大質量星形成領域における窒素を含む複雑な有機分子の起源
研究期間 2020年04月01日 - 2023年03月31日 - テラヘルツ天文学を切り開く高感度電波分光観測用受信機の開発
研究期間 2019年 - 2022年 - 原始惑星系円盤形成領域の化学組成とその進化
研究期間 2018年 - 2022年 - 超伝導素子と超伝導回路を融合した受信分光システム
研究期間 2019年 - 2021年 - 分子雲の進化を解明する30cmサブミリ波望遠鏡による銀河面サーベイ観測
瀬田益道
研究期間 2016年 - 2019年 - 高感度2ミリ帯分光観測による隠された爆発的星形成と巨大ブラックホールの研究
研究期間 2015年 - 2019年 - 分子輝線観測による大質量星なしクランプ内部での分子雲コア形成過程の解明
研究期間 2016年 - 2018年 - 多波長ラインサーベイによる星形成から惑星系形成に至る化学進化の解明
山本 智; 高野 秀路; 前澤 裕之; 廣田 朋也; 酒井 剛; 坂井 南美; 椎野 竜哉; 徳留 智矢; 相馬 達也; 猪熊 宏士; 西村 優里; 大屋 瑶子
日本学術振興会, 科学研究費助成事業, 東京大学, 基盤研究(S), 本研究では、低質量原始星まわりの円盤形成に伴う化学進化を電波観測で探求した。また、それに必要な高感度受信機を開発した。主な成果は次の通りである。(1)多波長スペクトル線サーベイ観測により、原始星エンベロープの化学的多様性を確立した。(2)原始星近傍の衝撃波領域でスペクトル線サーベイ観測により星間塵の化学組成の知見を得た。(3)低質量原始星L1527の高空間分解能観測を行い、原始星エンベロープの遠心力バリアの位置を初めて同定した。また、円盤形成に伴い化学組成が劇的に変化していることを見出した。(4)進化の進んだClass I段階の原始星、TMC-1A、で炭素鎖分子の消失を捉えた。, 21224002
研究期間 2009年05月11日 - 2014年03月31日 - NMAの単一鏡化と多周波2SB受信化による惑星中層大気環境の変動起源の観測的探求
前澤 裕之; 徳丸 宗利; 佐川 英夫; 笠井 康子; 奥田 武志; 笠羽 康正; 川辺 良平; 酒井 剛; 寺田 直樹; 水野 亮; 奥田 武志
日本学術振興会, 科学研究費助成事業, 大阪府立大学, 基盤研究(B), ハビタブルゾーンの理解を深めるため、太陽系惑星の大気環境監視プロジェクトを実施し、G 型星である太陽の活動が惑星中層大気に与える影響について観測的研究を推進した。野辺山宇宙電波観測所の干渉計望遠群から、口径 10m の望遠鏡1台切り離して単一鏡化し、惑星大気環境監視専用望遠鏡 SPART を立ち上げた。この結果、一酸化炭素輝線(100 GHz)のかつてない高頻度観測が実現し、金星については、高度80km 付近の一酸化炭素が過去数十年の中でも低い水準に留まっていることを見出した。太陽活動の紫外線や CME に伴う高エネルギー粒子イベントの最近の低下傾向などとの関連が示唆され、G～M 型星を中心星とする地球型惑星や系外惑星、太陽系の気候を理解する上で、重要な知見が得られた。, 22340042
研究期間 2010年 - 2012年
