Understanding the Initial Structures of Cluster Forming Clumps

• Project/Area Number: 17H02863
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Tokyo Gakugei University
• Principal Investigator: DOBASHI Kazuhito 東京学芸大学, 教育学部, 教授 (20237176)
• Co-Investigator(Kenkyū-buntansha): 中村 文隆 国立天文台, 理論研究部, 准教授 (20291354) ; 松本 倫明 法政大学, 人間環境学部, 教授 (60308004)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000); Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2017: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
• Keywords: 電波天文学 / データベース天文学

Outline of Final Research Achievements

In order to understand the formation process of clusters of stars like the Sun, we have performed molecular-line observations in the millimeter wavelengths, measurements of polarization and extinction in the optical and infrared wavelengths, and numerical simulations based on the magnetohydrodynamics, to reveal the kinetics of massive gaseous clumps having ~1000 solar mass which often forms clusters. Results of our studies have revealed that such massive clumps often exhibit an infalling motion with rotation in the beginning of cluster formation due to contraction by the self-gravity, and also that there are some clumps which have curious chemical composition and do not form clusters. Comparison with theoretical simulations indicates that the interstellar magnetic field should strongly influence the dynamics of the clumps and also the nature of the cluster formation.

Academic Significance and Societal Importance of the Research Achievements

銀河系は、約2000億個もの恒星から成る。これらの恒星は孤立して誕生するものもあるが、多くの恒星（おそらく半数以上）は星団のメンバーとして誕生していることが明らかになりつつある。よって、本研究で得られた新しい知見は、単に星団形成のみならず銀河系全体の形成や進化に関する理解に直結するものであり、その学術的な意義は大きい。我々の母なる太陽も、太古の昔、どこかの星団の中で形成されたことが示唆されている。太陽系や地球の起源を考える上でも、星団形成に関する理解は重要な役割を果たすものと思われる。

Research Products

• [Journal Article] Investigation of Chemical Differentiation among the NGC 2264 Cluster-Forming Clumps (2020)
  • Author(s): Kotomi Taniguchi, Adele Plunkett, Eric Herbst, Kazuhito Dobashi, Tomomi Shimoikura, Fumitaka Nakamura, and Masao Saito
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 493 Issue: 2 Pages: 2395-2409
  • DOI: 10.1093/mnras/staa012
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large-scale Molecular Gas Distribution in the M17 Cloud Complex: Dense Gas Conditions of Massive Star Formation? (2020)
  • Author(s): Quang Nguyen-Luong, Fumitaka Nakamura, Koji Sugitani, Tomomi Shimoikura, Kazuhito Dobashi, Shinichi W. Kinoshita, Kee-Tae Kim, Hynwoo Kang, Patricio Sanhueza, Neal J. Evans II and Glenn J. White
  • Journal Title: The Astrophysical Journal Volume: 891 Issue: 1 Pages: 66-80
  • DOI: 10.3847/1538-4357/ab700a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Interaction between the Northern Coalsack in the Cygnus OB 7 cloud complex and multiple supernova remnants including HB 21 (2019)
  • Author(s): Kazuhito Dobashi, Tomomi Shimoikura, Nobuhiro Endo, Chisato Takagi, Fumitaka Nakamura, Yoshito Shimajiri, and Jean-Philippe Bernard
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: Supplement_1
  • DOI: 10.1093/pasj/psy122
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nobeyama 45 m mapping observations toward Orion A. III. Multi-line observations toward an outflow-shocked region, Orion Molecular Cloud 2 FIR 4 (2019)
  • Author(s): Nakamura, F., Oyamada, S., Okumura, S., Ishii, S., Shimajiri, Y., Tanabe, Y., Tsukagoshi, T., Kawabe, R., Momose, M., Urasawa, Y., Nishi, R., Lin, S.-J., Lai, S.-P., Dobashi, K., Shimoikura, T., & Sugitani, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: Supplement_1
  • DOI: 10.1093/pasj/psz001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nobeyama 45 m mapping observations toward Orion A. II. Classification of cloud structures and variation of the 13CO/C18O abundance ratio due to far-UV radiation (2019)
  • Author(s): Ishii, S., Nakamura, F., Shimajiri, Y., Kawabe, R., Tsukagoshi, T., Dobashi, K., & Shimoikura, T.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: Supplement_1
  • DOI: 10.1093/pasj/psz065
  • Peer Reviewed
• [Journal Article] A Statistical Study of Massive Cluster-forming Clumps (2018)
  • Author(s): Shimoikura Tomomi、Dobashi Kazuhito、Nakamura Fumitaka、Matsumoto Tomoaki、Hirota Tomoya
  • Journal Title: The Astrophysical Journal Volume: 855 Issue: 1 Pages: 45-45
  • DOI: 10.3847/1538-4357/aaaccd
  • Peer Reviewed / Open Access
• [Journal Article] Spectral Tomography for the Line-of-sight Structures of the Taurus Molecular Cloud 1 (2018)
  • Author(s): Dobashi Kazuhito、Shimoikura Tomomi、Nakamura Fumitaka、Kameno Seiji、Mizuno Izumi、Taniguchi Kotomi
  • Journal Title: The Astrophysical Journal Volume: 864 Issue: 1 Pages: 82-82
  • DOI: 10.3847/1538-4357/aad62f
  • Peer Reviewed / Open Access
• [Journal Article] Interferometric Observations of Cyanopolyynes toward the G28.28-0.36 High-mass Star-forming Region (2018)
  • Author(s): Kotomi Taniguchi, Yusuke Miyamoto, Masao Saito, Patricio Sanhueza, Tomomi Shimoikura, Kazuhito Dobashi, Fumitaka Nakamura, and Hiroyuki Ozeki
  • Journal Title: The Astrophysical Journal Volume: 866 Issue: 1 Pages: 32-32
  • DOI: 10.3847/1538-4357/aadd0c
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] "Chemical Diversity in Three Hot Cores associated with the 6.7 GHz CH3OH Masers (2018)
  • Author(s): Taniguchi, K., Saito, M., Majumdar, L., Shimoikura, T., Dobashi, K., Ozeki, H., Nakamura, F., Hirota, T., Minamidani, T., Miyamoto, Y., Kaneko, H.
  • Journal Title: The Astrophysical Journal Volume: 866 Issue: 2 Pages: 150-150
  • DOI: 10.3847/1538-4357/aade97
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] N2H+分子輝線の解析法を学ぶための学部生用天文教材の開発 (2017)
  • Author(s): 広瀬亜紗、土橋一仁、下井倉ともみ、西浦慎悟
  • Journal Title: 地学教育 Volume: 70 Pages: 63-77
  • NAID: 130007493999
  • Peer Reviewed
• [Journal Article] Wide-field 12CO (J=2-1) and 13CO (J=2-1) Observations toward the Aquila Rift and Serpens Molecular Cloud Complexes. I. Molecular Clouds and Their Physical Properties (2017)
  • Author(s): Nakamura, F., Dobashi, K., Shimoikura, T., Tanaka, T., and Onishi, T.
  • Journal Title: The Astrophysical Journal Volume: 837 Issue: 2 Pages: 154-154
  • DOI: 10.3847/1538-4357/aa5ea6
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Observations of Cyanopolyynes toward Four High-mass Star-forming Regions Containing Hot Cores (2017)
  • Author(s): Taniguchi Kotomi、Saito Masao、Hirota Tomoya、Ozeki Hiroyuki、Miyamoto Yusuke、Kaneko Hiroyuki、Minamidani Tetsuhiro、Shimoikura Tomomi、Nakamura Fumitaka、Dobashi Kazuhito
  • Journal Title: The Astrophysical Journal Volume: 844 Issue: 1 Pages: 68-68
  • DOI: 10.3847/1538-4357/aa7899
  • Peer Reviewed
• [Journal Article] Correlation of gas dynamics and dust in the evolved filament G82.65-02.00 (2017)
  • Author(s): Saajasto M., Juvela M., Dobashi K., Shimoikura T., Ristorcelli I., Montillaud J., Malinen J., Pelkonen V. M., Feher O., Rivera-Ingraham A., Toth V., Montier L., Bernard J.-Ph., Onishi, T.
  • Journal Title: Astronomy & Astrophysics Volume: 608 Pages: A21-A21
  • DOI: 10.1051/0004-6361/201630005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 小学校理科の授業で天体望遠鏡を使おう！-初心者によくあるトラブルとその対策- (2017)
  • Author(s): 土橋一仁、下井倉ともみ、西浦慎悟、中田正隆
  • Journal Title: 東京学芸大学紀要 自然科学系 Volume: 69 Pages: 129-135
  • NAID: 120007047853
  • Open Access
• [Journal Article] 小中学校理科での活用を念頭においた地学教材「太陽系の旅-銀河系の回転と地質年代―」の開発 (2017)
  • Author(s): 清水今日子、土橋一仁、下井倉ともみ、佐藤たまき、生田巳裕、鉄矢悦朗
  • Journal Title: 東京学芸大学紀要 自然科学系 Volume: 69 Pages: 137-142
  • NAID: 120007047852
  • Open Access
• [Presentation] 可視光減光量による銀河スケールの厚いダストディスクの発見 (2020)
  • Author(s): 土橋一仁、西浦慎悟、中西裕之、下井倉ともみ
  • Organizer: 日本天文学会2020年春季年会
• [Presentation] オリオン座A分子雲周辺に分布するダストの光学的特性 (2020)
  • Author(s): 上原隼、土橋一仁、西浦慎悟、中西裕之、下井倉ともみ、直井隆浩
  • Organizer: 日本天文学会2020年春季年会
• [Presentation] W40とSerpens Southの星形成 (2020)
  • Author(s): 下井倉ともみ、土橋一仁、秦野義子、中村文隆
  • Organizer: 日本天文学会2020年春季年会
• [Presentation] 星形成レガシープロジェクトII：M17 SWex の星形成 (2019)
  • Author(s): 下井倉ともみ、土橋一仁、広瀬亜紗、中村文隆、島尻芳人、杉谷光司
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] 星形成レガシープロジェクトIV：はくちょう座領域の研究成果 (2019)
  • Author(s): 土橋一仁，片倉翔，遠藤修弘，高木知里、下井倉ともみ、中村文隆、島尻芳人、Jean-Philippe Bernard
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] TMC-1におけるゼーマン分裂検出と磁場強度測定 (2019)
  • Author(s): 中村文隆、楠根貴成、亀野誠司、土橋一仁、下井倉ともみ、谷口琴美、水野いづみ
  • Organizer: 日本天文学会
• [Presentation] おうし座分子雲周辺におけるダストの光学的性質の変化 (2019)
  • Author(s): 吉田悠人、土橋一仁、下井倉ともみ、西浦慎悟、上原隼、直井降浩
  • Organizer: 日本天文学会
• [Presentation] Serpens South Cloudの近赤外線偏光観測 (2018)
  • Author(s): 楠根貴成、中村文隆、土橋一仁、下井倉ともみ、杉谷光司
  • Organizer: 日本天文学会
• [Presentation] Revealing the line-of-sight structures of Taurus Molecular Cloud 1 (2018)
  • Author(s): Dobashi, K., Shimoikura, T., Nakamura, F., Seiji Kameno, Mizuno, I., and Taniguchi, K.
  • Organizer: The International Astronomical Union
  • Int'l Joint Research
• [Presentation] A Statistical Study of Cluster Formation (2018)
  • Author(s): Shimoikura, T., Dobashi, K., Shimoikura, T., Nakamura, F., Matsumoto, T. and Hirota, T.
  • Organizer: The International Astronomical Union
  • Int'l Joint Research
• [Presentation] Long cyanopolyynes at the G28.28-0.36 hot core (2018)
  • Author(s): Kotomi Taniguchi, Masao Saito, Yusuke Miyamoto, Tomomi Shimoikura, Kazuhito Dobashi, Tomoya Hirota, Fumitaka Nakamura, Hiroyuki Ozeki, Tetsuhiro Minamidani, Hiroyuki Kaneko
  • Organizer: 日本天文学会
• [Presentation] 星形成レガシープロジェクトIII W40とSerpens South領域のC18O分子輝線観測 (2018)
  • Author(s): 下井倉ともみ、土橋一仁、中村文隆
  • Organizer: 日本天文学会
• [Presentation] 星団を形成するクランプの統計的研究 (2018)
  • Author(s): 下井倉ともみ、土橋一仁、中村文隆、廣田朋也、松本倫明
  • Organizer: 日本天文学会
• [Presentation] 星団を形成するクランプの回転を伴う収縮運動 (2018)
  • Author(s): 土橋一仁、下井倉ともみ、中村文隆、廣田朋也、松本倫明
  • Organizer: 日本天文学会
• [Presentation] 星形成レガシープロジェクト M17 SWex領域の分子雲コアサーベイ (2017)
  • Author(s): 広瀬亜紗、土橋一仁、下井倉ともみ、中村文隆
  • Organizer: 日本天文学会
• [Presentation] HC3N・CCS分子輝線を利用したTMC-1の視線方向の構造解析 (2017)
  • Author(s): 土橋一仁、下井倉ともみ、平原純一、谷口琴美、水野いづみ、亀野誠二、中村文隆
  • Organizer: 日本天文学会
• [Presentation] 直線偏光観測とゼーマン観測を連携させた TMC-1 コアの磁場強度の見積もり (2017)
  • Author(s): 中村文隆、亀野誠二、水野いづみ、土橋一仁、下井倉ともみ、谷口琴美
  • Organizer: 日本天文学会
• [Presentation] Possibility of chemical differentiation among high-mass star-forming cores (2017)
  • Author(s): Kotomi Taniguchi, Masao Saito, Tomoya Hirota, Fumitaka Nakamura, Hiroyuki Ozeki,Yusuke Miyamoto, Hiroyuki Kaneko,Tetsuhiro Minamidani, Kazuhito Dobashi, Tomomi Shimoikura
  • Organizer: 日本天文学会
• [Presentation] 「太陽系の旅 銀河系の回転と地質年代」の教材開発 (2017)
  • Author(s): 清水今日子、土橋一仁、下井倉ともみ、佐藤たまき、生田巳裕、鉄矢悦朗
  • Organizer: 日本天文学会
• [Presentation] 小学校の授業で天体望遠鏡を使おう！初心者によくあるトラブルと対策 (2017)
  • Author(s): 土橋一仁、下井倉ともみ、西浦慎悟
  • Organizer: 日本天文学会
• [Presentation] N2H+分子輝線の解析の学部生向け教材の開発 (2017)
  • Author(s): 広瀬亜紗、土橋一仁、下井倉ともみ、西浦慎悟
  • Organizer: 日本天文学会