研究者詳細 - 徳田一起

お知らせ

写真a

トクダ　カズキ

徳田一起

TOKUDA KAZUKI

所属

理学研究院地球惑星科学部門学術研究員

外部リンク

学位

博士 (理学)

論文

Nobeyama 45 m Local Spur CO survey. I. Giant molecular filaments and cluster formation in the Vulpecula OB association

74 ( 1 ) 24 - 49 2022年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>We have performed new large-scale 12CO, 13CO, and C18O J = 1–0 observations toward the Vulpecula OB association (l ∼ 60°) as part of the Nobeyama 45 m Local Spur CO survey project. Molecular clouds are distributed over ∼100 pc, with local peaks at the Sh 2-86, Sh 2-87, and Sh 2-88 high-mass star-forming regions in the Vulpecula complex. The molecular gas is associated with the Local Spur, which corresponds to the nearest inter-arm region located between the Local Arm and the Sagittarius Arm. We discovered new giant molecular filaments (GMFs) in Sh 2-86, with a length of ∼30 pc, width of ∼5 pc, and molecular mass of $sim!! 4 imes 10^4, M_{odot }$. We also found that Sh 2-86 contains the three velocity components at 22, 27, and 33 km s−1. These clouds and GMFs are likely to be physically associated with Sh 2-86 because they have high 12CO J = 2–1 to J = 1–0 intensity ratios and coincide with the infrared dust emission. The open cluster NGC 6823 exists at the common intersection of these clouds. We argue that the multiple cloud interaction scenario, including GMFs, can explain cluster formation in the Vulpecula OB association.</jats:p>

DOI： 10.1093/pasj/psab107
An Unbiased CO Survey toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions

Kazuki Tokuda, Hiroshi Kondo, Takahiro Ohno, Ayu Konishi, Hidetoshi Sano, Kisetsu Tsuge, Sarolta Zahorecz, Nao Goto, Naslim Neelamkodan, Tony Wong, Marta Sewi{l}o, Hajime Fukushima, Tatsuya Takekoshi, Kazuyuki Muraoka, Akiko Kawamura, Kengo Tachihara, Yasuo Fukui, Toshikazu Onishi

The Astrophysical Journal 922 ( 2 ) 171 - 171 2021年12月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ac1ff4
ALMA CO Observations of the Mixed-morphology Supernova Remnant W49B: Efficient Production of Recombining Plasma and Hadronic Gamma Rays via Shock–Cloud Interactions

919 ( 2 ) 123 - 123 2021年10月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ac0dba
First extragalactic measurement of the turbulence driving parameter: ALMA observations of the star-forming region N159E in the Large Magellanic Cloud

Piyush Sharda, Shyam H Menon, Christoph Federrath, Mark R Krumholz, James R Beattie, Katherine E Jameson, Kazuki Tokuda, Blakesley Burkhart, Rol, M Crocker, Charles J Law, Amit Seta, Terrance J Gaetz, Nickolas M Pingel, Ivo R Seitenzahl, Hidetoshi Sano, Yasuo Fukui

Monthly Notices of the Royal Astronomical Society 2021年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/mnras/stab3048
Associated Molecular and Atomic Clouds with X-Ray Shell of Superbubble 30 Doradus C in the LMC

Y. Yamane, H. Sano, M. D. Filipovi{'{c } }, K. Tokuda, K. Fujii, Y. Babazaki, I. Mitsuishi, T. Inoue, F. Aharonian, T. Inaba, S. Inutsuka, N. Maxted, N. Mizuno, T. Onishi, G. Rowell, K. Tsuge, F. Voisin, S. Yoshiike, T. Fukuda, A. Kawamura, A. Bamba, K. Tachihara, Y. Fukui

The Astrophysical Journal 918 ( 1 ) 36 - 36 2021年9月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ac0adb
Physical Conditions in the LMC’s Quiescent Molecular Ridge: Fitting Non-LTE Models to CO Emission

Molly K. Finn, Remy Indebetouw, Kelsey E. Johnson, Allison H. Costa, C.-H. Rosie Chen, Akiko Kawamura, Toshikazu Onishi, Jürgen Ott, Kazuki Tokuda, Tony Wong, Sarolta Zahorecz

917 ( 2 ) 106 - 106 2021年8月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ac090c
ALMA Observations of Giant Molecular Clouds in M33. III. Spatially Resolved Features of the Star formation Inactive Million-solar-mass Cloud

Hiroshi Kondo, Kazuki Tokuda, Kazuyuki Muraoka, Atsushi Nishimura, Shinji Fujita, Tomoka Tosaki, Sarolta Zahorecz, Rie E. Miura, Masato I. N. Kobayashi, Sachiko Onodera, Kazufumi Torii, Nario Kuno, Hidetoshi Sano, Toshikazu Onishi, Kazuya Saigo, Yasuo Fukui, Akiko Kawamura, Kisetsu Tsuge, Kengo Tachihara

The Astrophysical Journal 912 ( 1 ) 66 - 66 2021年5月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/abeb65
The formation of the young massive cluster B1 in the Antennae Galaxies (NGC 4038/NGC 4039) triggered by cloud–cloud collision

73 ( 2 ) 417 - 430 2021年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<title>Abstract</title>
The Antennae Galaxies, one of major mergers, are a starburst. Tsuge et al. (2020, PASJ, 73, S35) showed that the five giant molecular complexes in the Antennae Galaxies have signatures of cloud–cloud collisions based on the Atacama Large Millimeter Array (ALMA) archival data with 60 pc resolution. In the present work we analyzed the new CO data toward the super star cluster (SSC) B1 with 14 pc resolution obtained with ALMA, and confirm that two clouds show a complementary distribution with a displacement of ∼70 pc as well as connecting bridge features between them. The complementary distribution shows a good correspondence with the theoretical collision model (Takahira et al. 2014, ApJ, 792, 63), and the distribution indicates that the formation of SSC B1 with ∼106 M⊙ was consistent with the trigger of cloud–cloud collision on a time scale of ∼1 Myr, which is consistent with the cluster age. It is likely that SSC B1 was formed from molecular gas of ∼107 M⊙ with a star formation efficiency of $sim! 10%$ in 1 Myr. We identify a few places where additional clusters are forming. Detailed gas motion indicates that the stellar feedback in the accelerating gas is not effective, while the ionization plays a role in evacuating the gas around the clusters at a ∼20 pc radius. The results have revealed the details of the parent gas where a cluster having a mass similar to a globular is being formed.

DOI： 10.1093/pasj/psab008
ALMA Reveals a Cloud–Cloud Collision that Triggers Star Formation in the Small Magellanic Cloud

908 ( 2 ) L43 - L43 2021年2月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/2041-8213/abdebb
ALMA view of the Galactic super star cluster RCW 38 at 270 au resolution 査読

73 ( 1 ) 205 - 219 2021年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<title>ABSTRACT</title>
We report millimeter/submillimeter continuum and molecular line observations of the Galactic super star cluster RCW 38, obtained from the Atacama Large Millimeter/Submillimeter Array with a minimum angular resolution of ${0{^{prime prime }_{. } }17} imes {0{^{prime prime }_{. } }15}$ (≃ 289 au × 255 au). The C18O image reveals many massive condensations embedded within filamentary structures extending along the northwest–southeast direction in the center of cluster. The condensations have sizes of 0.01–0.02 pc, H2 column densities of 1023–1024 cm−2, and H2 masses of 10–130 M⊙. In addition, the 233 GHz continuum image reveals two dense, small millimeter-sources with radii of 460 and 200 au (Source A and Source B). Source A is embedded within the most massive C18O condensation, whereas no counterpart is seen for Source B. The masses of Source A and Source B are estimated as 13 and 3 M⊙ at the optically thin limit, respectively. The C18O emission shows a velocity gradient of 2 km s−1 at the central 2000 au of Source A, which could be interpreted as a Keplerian rotation with a central mass of a few M⊙ or infall motion of gas. Further, the ALMA 12CO data reveal that Source A and Source B are associated with molecular outflows exhibiting maximum velocities of ∼30–70 km s−1. The outflows have short dynamical timescales of &lt;1000 yr and high-mass outflow rates of ∼10−4–10−3 M⊙ yr−1. These observational signatures suggest an early evolutionary phase of the massive star formation in Source A and Source B.

DOI： 10.1093/pasj/psaa115
Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project

Atsushi Nishimura, Kazuki Tokuda, Ryohei Harada, Yutaka Hasegawa, Shota Ueda, Sho Masui, Ryotaro Konishi, Yasumasa Yamasaki, Hiroshi Kondo, Koki Yokoyama, Takeru Matsumoto, Taisei Minami, Masanari Okawa, Shinji Fujita, Ayu Konishi, Yuka Nakao, Shimpei Nishimoto, Sana Kawashita, Sho Yoneyama, Tatsuyuki Takashima, Kenta Goto, Nozomi Okada, Kimihiro Kimura, Yasuhiro Abe, Kazuyuki Muraoka, Hiroyuki Maezawa, Toshikazu Onishi, Hideo Ogawa

Ground-based and Airborne Telescopes VIII 2020年12月

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記述言語：その他掲載種別：研究論文（その他学術会議資料等）

DOI： 10.1117/12.2560955
ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7–3946: Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc Scales 査読

H. Sano, T. Inoue, K. Tokuda, T. Tanaka, R. Yamazaki, S. Inutsuka, F. Aharonian, G. Rowell, M. D. Filipović, Y. Yamane, S. Yoshiike, N. Maxted, H. Uchida, T. Hayakawa, K. Tachihara, Y. Uchiyama, Y. Fukui

904 ( 2 ) L24 - L24 2020年11月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/2041-8213/abc884
ALMA Observations of Giant Molecular Clouds in M33. II. Triggered High-mass Star Formation by Multiple Gas Colliding Events at the NGC 604 Complex 査読

Kazuyuki Muraoka, Hiroshi Kondo, Kazuki Tokuda, Atsushi Nishimura, Rie E. Miura, Sachiko Onodera, Nario Kuno, Sarolta Zahorecz, Kisetsu Tsuge, Hidetoshi Sano, Shinji Fujita, Toshikazu Onishi, Kazuya Saigo, Kengo Tachihara, Yasuo Fukui, Akiko Kawamura

The Astrophysical Journal 903 ( 2 ) 94 - 94 2020年11月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/abb822
ALMA Observations of HCO+ and HCN Emission in the Massive Star-forming Region N55 of the Large Magellanic Cloud 査読

Nayana A. J., Naslim N., T. Onishi, F. Kemper, K. Tokuda, S. C. Madden, O. Morata, S. Nasri, M. Galametz

The Astrophysical Journal 902 ( 2 ) 140 - 140 2020年10月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/abb466
ALMA CO Observations of Gamma-Ray Supernova Remnant N132D in the Large Magellanic Cloud: Possible Evidence for Shocked Molecular Clouds Illuminated by Cosmic-Ray Protons 査読

The Astrophysical Journal 902 ( 1 ) 53 - 53 2020年10月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/abb469
FRagmentation and Evolution of Dense Cores Judged by ALMA (FREJA). I. Overview: Inner ∼1000 au Structures of Prestellar/Protostellar Cores in Taurus 査読

2020年8月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ab9ca7
A Low-velocity Bipolar Outflow from a Deeply Embedded Object in Taurus Revealed by the Atacama Compact Array 査読

Kazuki Tokuda

The Astrophysical Journal 899 ( 1 ) L10 - L10 2020年8月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/2041-8213/ab9ca8
Chemical Composition in the IRAS 16562–3959 High-mass Star-forming Region 査読

Kotomi Taniguchi, Andrés E. Guzmán, Liton Majumdar, Masao Saito, Kazuki Tokuda

898 ( 1 ) 54 - 54 2020年7月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ab994d
The formation of young massive clusters triggered by cloud–cloud collisions in the Antennae galaxies NGC 4038/NGC 4039 査読

2020年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>The formation mechanism of super star clusters (SSCs), present-day analogs of the ancient globulars, still remains elusive. The major merger that is the Antennae galaxies is forming SSCs and is one of the primary targets to test the cluster formation mechanism. We reanalyzed the archival ALMA CO data of the Antennae and found three typical observational signatures of a cloud–cloud collision toward SSC B1 and other SSCs in the overlap region: (i) two velocity components with ∼100 km s−1 velocity separation, (ii) bridge features connecting the two components, and (iii) a complementary spatial distribution between them, lending support to collisions of the two components as a cluster formation mechanism. We present a scenario that two clouds with 100 km s−1 velocity separation collided, and SSCs having ∼106–107 M⊙ were formed rapidly during that time scale. We compared the present results with the recent studies of star-forming regions in the Milky Way and the Large Magellanic Cloud, where the SSCs having ∼104–105 M⊙ are located. As a result, we found that there is a positive correlation between the compressed gas pressure generated by collisions and the total stellar mass of an SSC, suggesting that the pressure may be a key parameter in SSC formation.</jats:p>

DOI： 10.1093/pasj/psaa033
ALMA CO observations of a giant molecular cloud in M 33: Evidence for high-mass star formation triggered by cloud–cloud collisions 査読

2020年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M 33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M 33 using 12CO(J = 2–1), 13CO(J = 2–1), and C18O(J = 2–1) line emission at a spatial resolution of ∼2 pc. There are two individual molecular clouds with a systematic velocity difference of ∼6 km s−1. Three continuum sources representing up to ∼10 high-mass stars with spectral types of B0V–O7.5V are embedded within the densest parts of molecular clouds bright in the C18O(J = 2–1) line emission. The two molecular clouds show a complementary spatial distribution with a spatial displacement of ∼6.2 pc, and show a V-shaped structure in the position–velocity diagram. These observational features traced by CO and its isotopes are consistent with those in high-mass star-forming regions created by cloud–cloud collisions in the Galactic and Magellanic Cloud H ii regions. Our new finding in M 33 indicates that cloud–cloud collision is a promising process for triggering high-mass star formation in the Local Group.</jats:p>

DOI： 10.1093/pasj/psaa045
ALMA Observations of Giant Molecular Clouds in M33. I. Resolving Star Formation Activities in the Giant Molecular Filaments Possibly Formed by a Spiral Shock

Kazuki Tokuda, Kazuyuki Muraoka, Hiroshi Kondo, Atsushi Nishimura, Tomoka Tosaki, Sarolta Zahorecz, Sachiko Onodera, Rie E. Miura, Kazufumi Torii, Nario Kuno, Shinji Fujita, Hidetoshi Sano, Toshikazu Onishi, Kazuya Saigo, Yasuo Fukui, Akiko Kawamura, Kengo Tachihara

The Astrophysical Journal 896 ( 1 ) 36 - 36 2020年6月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ab8ad3
FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). VI. Dense gas and mini-starbursts in the W 43 giant molecular cloud complex

2020年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<title>Abstract</title>
We performed new large-scale 12CO, 13CO, and C18O J = 1–0 observations of the W 43 giant molecular cloud complex in the tangential direction of the Scutum arm (l ∼30°) as a part of the FUGIN project. The low-density gas traced by 12CO is distributed over 150 pc × 100 pc (l × b), and has a large velocity dispersion (20–30 km s−1). However, the dense gas traced by C18O is localized in the W 43 Main, G30.5, and W 43 South (G29.96−0.02) high-mass star-forming regions in the W 43 giant molecular cloud (GMC) complex, which have clumpy structures. We found at least two clouds with a velocity difference of ∼10–20 km s−1, both of which are likely to be physically associated with these high-mass star-forming regions based on the results of high 13CO J = 3–2 to J = 1–0 intensity ratio and morphological correspondence with the infrared dust emission. The velocity separation of these clouds in W 43 Main, G30.5, and W 43 South is too large for each cloud to be gravitationally bound. We also revealed that the dense gas in the W 43 GMC has a high local column density, while “the current SFE” (star formation efficiency) of the entire GMC is low ($sim!! 4%$) compared with the W 51 and M 17 GMC. We argue that the supersonic cloud–cloud collision hypothesis can explain the origin of the local mini-starbursts and dense gas formation in the W 43 GMC complex.

DOI： 10.1093/pasj/psaa015
Development of a 22/43 GHz-band quasi-optical perforated plate and dual-band observation system of the Nobeyama 45 m telescope 査読

2020年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>We have developed a system of simultaneous observations in the 22 and 43 GHz bands using the Nobeyama 45 m telescope, and are also working to add the 86 GHz band. Multi-frequency observations are realized by mounting perforated plates in the optics as dichroic frequency-selective devices. This paper presents the development of the perforated plate for the 22 and 43 GHz bands and the results of the commissioning observations with this plate on the Nobeyama 45 m telescope. The perforated plate is designed to be installed in the large telescope optics with a physical beam diameter as large as $50:$cm for transmitting the higher frequency (43 GHz) band and for reflecting the lower frequency (22 GHz) band. The developed plate achieves an insertion loss of $0.22:$dB (5%) at $43:$GHz. The effects of the mounted plate on the systematic offsets and on the accuracy degradation of pointing were confirmed to be negligible. The differences in the main-beam/aperture efficiencies from those without the plate were confirmed to be within a few percent points. In addition, we successfully detected interferometry fringes in a very long baseline interferometry (VLBI) observation using the 45 m telescope and the VLBI Exploration of Radio Astrometry (VERA) 20 m telescopes, which confirmed that the dual-band observation system is operationally effective in both single-dish and VLBI observations.</jats:p>

DOI： 10.1093/pasj/psz126
Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud 査読

Kazuki Tokuda

The Astrophysical Journal 2019年10月

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記述言語：その他掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/ab46ba
A centrally concentrated sub-solar-mass starless core in the Taurus L1495 filamentary complex 査読

Kazuki Tokuda, Kengo Tachihara, Kazuya Saigo, Phillipe Andre, Yosuke Miyamoto, Sarolta Zahorecz, Shu-ichiro Inutsuka, Tomoaki Matsumoto, Tatsuyuki Takashima, Masahiro N. Machida, Kengo Tomida, Kotomi Taniguchi, Yasuo Fukui, Akiko Kawamura, Ken'ichi Tatematsu, Ryo Kandori, Toshikazu Onishi

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 71 ( 4 ) 2019年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/pasj/psz051
Molecular Cloud Structures and Massive Star Formation in N159 査読

O. Nayak, M. Meixner, Y. Fukui, K. Tachihara, T. Onishi, K. Saigo, K. Tokuda, R. Harada

Astrophysical Journal 854 ( 2 ) 2018年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aaab5f
ALMA Reveals Molecular Cloud N55 in the Large Magellanic Cloud as a Site of Massive Star Formation 査読

N. Naslim, K. Tokuda, T. Onishi, F. Kemper, T. Wong, O. Morata, S. Takada, R. Harada, A. Kawamura, K. Saigo, R. Indebetouw, S. C. Madden, S. Hony, M. Meixner

Astrophysical Journal 853 ( 2 ) 2018年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aaa5b0
ALMA Observations of a Quiescent Molecular Cloud in the Large Magellanic Cloud 査読

Astrophysical Journal 850 ( 2 ) 2017年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aa9333
ALMA Observations of N83C in the Early Stage of Star Formation in the Small Magellanic Cloud 査読

Kazuyuki Muraoka, Aya Homma, Toshikazu Onishi, Kazuki Tokuda, Ryohei Harada, Yuuki Morioka, Sarolta Zahorecz, Kazuya Saigo, Akiko Kawamura, Norikazu Mizuno, Tetsuhiro Minamidani, Erik Muller, Yasuo Fukui, Margaret Meixner, Remy Indebetouw, Marta Sewilo, Alberto Bolatto

ASTROPHYSICAL JOURNAL 844 ( 2 ) 98 2017年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aa7a0b
A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477 査読

Kazufumi Torii, Yusuke Hattori, Keisuke Hasegawa, Akio Ohama, Hiroaki Yamamoto, Kengo Tachihara, Kazuki Tokuda, Toshikazu Onishi, Yasuki Hattori, Daisuke Ishihara, Hidehiro Kaneda, Yasuo Fukui

Astrophysical Journal 840 ( 2 ) 2017年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aa6fa8
A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477 査読

Kazufumi Torii, Yusuke Hattori, Keisuke Hasegawa, Akio Ohama, Hiroaki Yamamoto, Kengo Tachihara, Kazuki Tokuda, Toshikazu Onishi, Yasuki Hattori, Daisuke Ishihara, Hidehiro Kaneda, Yasuo Fukui

ASTROPHYSICAL JOURNAL 840 ( 2 ) 2017年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/aa6fa8
KINEMATIC STRUCTURE OF MOLECULAR GAS AROUND HIGH-MASS YSO, PAPILLON NEBULA, IN N159 EAST IN THE LARGE MAGELLANIC CLOUD: A NEW PERSPECTIVE WITH ALMA 査読

Kazuya Saigo, Toshikazu Onishi, Omnarayani Nayak, Margaret Meixner, Kazuki Tokuda, Ryohei Harada, Yuuki Morioka, Marta Sewilo, Remy Indebetouw, Kazufumi Torii, Akiko Kawamura, Akio Ohama, Yusuke Hattori, Hiroaki Yamamoto, Kengo Tachihara, Tetsuhiro Minamidani, Tsuyoshi Inoue, Suzanne Madden, Maud Galametz, Vianney Lebouteiller, C. -H. Rosie Chen, Norikazu Mizuno, Yasuo Fukui

ASTROPHYSICAL JOURNAL 835 ( 1 ) 2017年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/835/1/108
KINEMATIC STRUCTURE of MOLECULAR GAS AROUND HIGH-MASS YSO, PAPILLON NEBULA, in N159 EAST in the LARGE MAGELLANIC CLOUD: A NEW PERSPECTIVE with ALMA 査読

Astrophysical Journal 835 ( 1 ) 2017年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/1538-4357/835/1/108
REVEALING A DETAILED MASS DISTRIBUTION OF A HIGH-DENSITY CORE MC27/L1521F IN TAURUS WITH ALMA 査読

Kazuki Tokuda, Toshikazu Onishi, Tomoaki Matsumoto, Kazuya Saigo, Akiko Kawamura, Yasuo Fukui, Shu-ichiro Inutsuka, Masahiro N. Machida, Kengo Tomida, Kengo Tachihara, Philippe Andre

ASTROPHYSICAL JOURNAL 826 ( 1 ) 2016年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3847/0004-637X/826/1/26
Z45: A new 45-GHz band dual-polarization HEMT receiver for the NRO 45-m radio telescope 査読

Fumitaka Nakamura, Hideo Ogawa, Yoshinori Yonekura, Kimihiko Kimura, Nozomi Okada, Minato Kozu, Yutaka Hasegawa, Kazuki Tokuda, Tetsu Ochiai, Izumi Mizuno, Kazuhito Dobashi, Tomomi Shimoikura, Seiji Kameno, Kotomi Taniguchi, Hiroko Shinnaga, Shuro Takano, Ryohei Kawabe, Taku Nakajima, Daisuke Iono, Nario Kuno, Toshikazu Onishi, Munetake Momose, Satoshi Yamamoto

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 67 ( 6 ) 2015年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/pasj/psv088
HIGH-MASS STAR FORMATION TRIGGERED BY COLLISION BETWEEN CO FILAMENTS IN N159 WEST IN THE LARGE MAGELLANIC CLOUD 査読

Astrophysical Journal Letters 807 ( 1 ) 2015年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/2041-8205/807/1/L4
An origin of arc structures deeply embedded in dense molecular cloud cores 査読

Tomoaki Matsumoto, Toshikazu Onishi, Kazuki Tokuda, Shu-ichiro Inutsuka

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449 ( 1 ) L123 - L127 2015年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/mnrasl/slv031
An origin of arc structures deeply embedded in dense molecular cloud cores 査読

Tomoaki Matsumoto, Toshikazu Onishi, Kazuki Tokuda, Shu-ichiro Inutsuka

Monthly Notices of the Royal Astronomical Society: Letters 449 ( 1 ) L123 - L127 2015年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/mnrasl/slv031
REVEALING THE PHYSICAL PROPERTIES OF MOLECULAR GAS IN ORION WITH A LARGE-SCALE SURVEY IN J=2-1 LINES OF (CO)-C-12, (CO)-C-13, AND (CO)-O-18 査読

Atsushi Nishimura, Kazuki Tokuda, Kimihiro Kimura, Kazuyuki Muraoka, Hiroyuki Maezawa, Hideo Ogawa, Kazuhito Dobashi, Tomomi Shimoikura, Akira Mizuno, Yasuo Fukui, Toshikazu Onishi

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 216 ( 1 ) 2015年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/0067-0049/216/1/18
CLUSTER FORMATION TRIGGERED BY FILAMENT COLLISIONS IN SERPENS SOUTH 査読

Fumitaka Nakamura, Koji Sugitani, Tomohiro Tanaka, Hiroyuki Nishitani, Kazuhito Dobashi, Tomomi Shimoikura, Yoshito Shimajiri, Ryohei Kawabe, Yoshinori Yonekura, Izumi Mizuno, Kimihiko Kimura, Kazuki Tokuda, Minato Kozu, Nozomi Okada, Yutaka Hasegawa, Hideo Ogawa, Seiji Kameno, Hiroko Shinnaga, Munetake Momose, Taku Nakajima, Toshikazu Onishi, Hiroyuki Maezawa, Tomoya Hirota, Shuro Takano, Daisuke Iono, Nario Kuno, Satoshi Yamamoto

ASTROPHYSICAL JOURNAL LETTERS 791 ( 2 ) L23 - 308 2014年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/2041-8205/791/2/L23
ALMA OBSERVATIONS OF A HIGH-DENSITY CORE IN TAURUS: DYNAMICAL GAS INTERACTION AT THE POSSIBLE SITE OF A MULTIPLE STAR FORMATION 査読

Kazuki Tokuda, Toshikazu Onishi, Kazuya Saigo, Akiko Kawamura, Yasuo Fukui, Tomoaki Matsumoto, Shu-ichiro Inutsuka, Masahiro N. Machida, Kengo Tomida, Kengo Tachihara

ASTROPHYSICAL JOURNAL LETTERS 789 ( 1 ) 2014年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/2041-8205/789/1/L4

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ALMA view of the ρ ophiuchi a PDR with a 360 au Beam: The [C I] Emission originates from the plane-parallel PDR and extended gas

2021年6月

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記述言語：その他

We present the results of data analysis of the [C I] (3P1–3P0) emission from the ρ Ophiuchi A photon-dominated region (PDR) obtained in the ALMA ACA standalone mode with a spatial resolution of 2 6 (360 au). The [C I] emission shows filamentary structures with a width of ∼1000 au, which are adjacent to the shell structure seen in the 4.5 μm map. We found that the 4.5 μm emission, C0, and CO are distributed in this order from the excitation star (S1) in a complementary pattern. These results indicate that [C I] is emitted from a thin layer in the PDR generated by the excitation star, as predicted in the plane-parallel PDR model. In addition, extended [C I] emission was also detected, which shows nearly uniform integrated intensity over the entire field of view (1 6 × 1 6). The line profile of the extended component is different from that of the above shell component. The column density ratio of C0 to CO in the extended component was ∼2, which is significantly higher than those of Galactic massive star-forming regions (0.1–0.2). These results suggest that [C I] is emitted also from the extended gas with a density of nH2 ~ 103 cm-3, which is not greatly affected by the excitation star.

DOI： 10.3847/2041-8213/ac0250
Large-Scale Molecular Gas Survey in 12CO, 13CO and C18O (J=2-1) with the Osaka 1.85m mm-submm Telescope

Onishi, Toshikazu, Nishimura, Atsushi, Tokuda, Kazuki, Harada, Ryohei, Dobashi, Kazuhito, Shimoikura, Tomomi, Kimura, Kimihiro, Ogawa, Hideo

IAU General Assembly, Meeting 2015年8月

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記述言語：その他
HIGH-MASS STAR FORMATION TRIGGERED BY COLLISION BETWEEN CO FILAMENTS IN N159 WEST IN THE LARGE MAGELLANIC CLOUD

Yasuo Fukui, Ryohei Harada, Kazuki Tokuda, Yuuki Morioka, Toshikazu Onishi, Kazufumi Torii, Akio Ohama, Yusuke Hattori, Omnarayani Nayak, Margaret Meixner, Marta Sewilo, Remy Indebetouw, Akiko Kawamura, Kazuya Saigo, Hiroaki Yamamoto, Kengo Tachihara, Tetsuhiro Minamidani, Tsuyoshi Inoue, Suzanna Madden, Maud Galametz, Vianney Lebouteiller, Norikazu Mizuno, C. -H. Rosie Chen

ASTROPHYSICAL JOURNAL LETTERS 2015年7月

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記述言語：英語

DOI： 10.1088/2041-8205/807/1/L4
NROレガシープロジェクト:銀河面COサーベイ

梅本智文, 久野成夫, 廣田明彦, 南谷哲宏, 諸隈佳菜, 新永浩子, 本間希樹, 水野範和, 樋口あや, 半田利弘, 面高俊宏, 中西裕之, 松尾光洋, 小澤武揚, 大西利和, 西村淳, 徳田一起, 濤崎智佳, 小高大樹, 小野寺幸子, 祖父江義明, 津田裕也, 鳥居和史, 中島大智, 大橋聡史, 坪井昌人

日本天文学会年会講演予稿集 2013年8月

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記述言語：日本語

所属学協会

国際天文学連合(IAU)
日本天文学会

共同研究・競争的資金等の研究課題

分子雲コア寿命の測定を通した星団形成機構の解明

研究課題/領域番号：21K13962 2021年 - 2023年

日本学術振興会科学研究費助成事業基盤研究(C)

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担当区分：研究代表者資金種別：科研費
低金属量環境下における分子ガス雲トレーサーとしての一酸化炭素分子輝線の挙動解明

研究課題/領域番号：21H00049 2021年 - 2022年

日本学術振興会科学研究費助成事業基盤研究(C)

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担当区分：研究代表者資金種別：科研費
重水素分子で探る星形成の極初期

研究課題/領域番号：20H05645 2020年 - 2024年

日本学術振興会科学研究費助成事業基盤研究(C)

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担当区分：研究分担者資金種別：科研費
分子雲コア精密観測による乱流起源の超低質星/褐色矮星形成メカニズムの調査

2018年 - 2019年

日本学術振興会科学研究費助成事業基盤研究(C)

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担当区分：研究代表者資金種別：科研費