Study of massive star formation by cloud cloud collision

• Project/Area Number: 15K05014
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Hokkaido University
• Principal Investigator: Habe Asao 北海道大学, 理学研究院, 名誉教授 (90180926)
• Co-Investigator(Kenkyū-buntansha): タスカー エリザベス 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (40620373)
• Research Collaborator: Fukui Yasuo 名古屋大学 ; Torii Kazufumi 国立天文台 ; Greg Bryan コロンビア大学 ; Christoph Federrath オーストリア国立大学
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 大質量星 / 星形成 / 分子雲 / 星間物質 / 数値シミュレーション / 分子雲衝突 / 大質量星形成 / 分子雲コアの質量関数 / 分子雲コア / 内部乱流 / 磁場 / 電離光子輻射輸送

Outline of Final Research Achievements

We simulate cloud cloud collisions by using three dimensional numerical hydrodynamic code, ENZO, that is an AMR code, including turbulent motion in clouds, self-gravity of gas, radiative cooling process and UV feed back effects by newly formed massive stars by using the sink particle model. We assume non-identical clouds with various cloud mass and collision speeds of clouds. We found that massive dense cores are form in the shocked layer formed by cloud cloud collisions, mass function of dense cores is a power law form similar to the observation. The mass function depends on cloud mass and collision speed. We found that massive dense cores that are possible to form massive stars are formed in the observed collision speed range.
UV feed back by massive stars formed in early stage of could-cloud collision is mainly effective to ionize low gas density regions and is hard to change massive dense core formation condition by cloud cloud. collision.

Academic Significance and Societal Importance of the Research Achievements

本研究は、これまで未解明だった大質量星形成について、分子雲衝突による可能性を理論的に示したことで、銀河における星形成の研究に大きく寄与している。現在分子雲衝突による星形成は観測的に盛んに研究されているが、分子雲衝突に特有な構造が我々の数値シミュレーションによって示され、それを応用した観測的研究が進んでいる。また、我々は大質量星形成に結びつく大質量高密度コア形成の分子雲の衝突速度依存性を示し、それを考慮した星形成について議論したが、その関係は宇宙論的銀河シミュレーショングループからも注目されている。また、有名なオリオン星雲の起源について、我々の研究は寄与しその成果は新聞でも報道された。

Research Products

• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Int'l Joint Research] コロンビア大学(米国)
• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Int'l Joint Research] コロンビア大学(米国)
• [Int'l Joint Research] ハイデルベルグ大学/マックスプランク研究所(ドイツ)
• [Int'l Joint Research] Imperial College London(英国)
• [Int'l Joint Research] コロンビア大学(米国)
• [Int'l Joint Research] ケンブリッジ大学(英国)
• [Int'l Joint Research] the Excellence Cluster Universe研究所(ドイツ)
• [Journal Article] The changing GMC population in galaxy interactions (2018)
  • Author(s): Authors: Pettitt, Alex R.; Egusa, Fumi; Dobbs, Clare L.; Tasker, Elizabeth J.; Fujimoto, Yusuke; Habe, Asao
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 480 Issue: 3 Pages: 3356-3375
  • DOI: 10.1093/mnras/sty2040
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] CO observations of the molecular gas in the Galactic HII region Sh2-48: Evidence for cloud-cloud collision as a trigger of high-mass star formation (2018)
  • Author(s): Torii Kazufumi、Hattori Yusuke、Matsuo Mitsuhiro,..., Ohama Akio et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: Supplement_1 Pages: 121-121
  • DOI: 10.1093/pasj/psy098
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC1300 and NGC5383 (2018)
  • Author(s): Maeda Fumiya、Ohta Kouji、Fujimoto Yusuke、Habe Asao、Baba Junichi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 3 Pages: 37-45
  • DOI: 10.1093/pasj/psy028
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A New Look at the Molecular Gas in M42 and M43: Possible Evidence for Cloud-Cloud Collision that Triggered Formation of the OB Stars in the Orion Nebula Cluster (2018)
  • Author(s): Fukui Yasuo、Torii Kazufumi、Hattori Yusuke,..., Ohama Akio et al.
  • Journal Title: The Astrophysical Journal Volume: 859 Issue: 2 Pages: 166-187
  • DOI: 10.3847/1538-4357/aac217
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Formation of massive, dense cores by cloud-cloud collisions (2018)
  • Author(s): Takahira, Ken; Shima, Kazuhiro; Habe, Asao; Tasker, Elizabeth J.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中 Issue: SP2 Pages: 58-70
  • DOI: 10.1093/pasj/psy011
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large-scale CO J=1-0 observations of the giant molecular cloud associated with the infrared ring N35 with the Nobeyama 45-m telescope (2018)
  • Author(s): Torii Kazufumi, Fujita, Shinji, Matsuo, Mitsuhiro, Nishimura, Atsushi, Kohno, Mikito, Kuriki, Mika, Tsuda, Yuya, Minamidani, Tetsuhiro, Umemoto, Tomofumi, Kuno, Nario, Hattori, Yusuke, Yoshiike, Satoshi, Ohama, Akio, Tachihara, Kengo, Shima, Kazuhiro, Habe, Asao, Fukui, Yasuo
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中 Issue: SP2 Pages: 51-51
  • DOI: 10.1093/pasj/psy019
  • Peer Reviewed / Open Access
• [Journal Article] The effect of photoionizing feedback on star formation in isolated and colliding clouds (2017)
  • Author(s): Shima, Kazuhiro; Tasker, Elizabeth J.; Federrath, Christoph; Habe, Asao
  • Journal Title: Publications of the Astronomical Society of Japan Volume: - Issue: SP2 Pages: 54-64
  • DOI: 10.1093/pasj/psx124
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Triggered O Star Formation in M20 via Cloud-Cloud Collision: Comparisons between High-resolution CO Observations and Simulations (2017)
  • Author(s): Torii, K., Hattori, Y., Hasegawa, K., Ohama, A., Haworth, T. J., Shima, K., Habe, A., Tachihara, K., Mizuno, N., Onishi, T., Mizuno, A., and Fukui, Y.
  • Journal Title: The Astrophysical Journal Volume: 835 Issue: 2 Pages: 142-153
  • DOI: 10.3847/1538-4357/835/2/142
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] On the effective turbulence driving mode of molecular clouds formed in disc galaxies (2017)
  • Author(s): Jin Keitaro、Salim Diane M.、Federrath Christoph、Tasker Elizabeth J.、Habe Asao、Kainulainen Jouni T.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 469 Issue: 1 Pages: 383-393
  • DOI: 10.1093/mnras/stx737
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Does feedback help or hinder star formation? The effect of photoionization on star formation in giant molecular clouds (2017)
  • Author(s): Shima, Kazuhiro; Tasker, Elizabeth J.; Habe, Asao
  • Journal Title: Monthly Notices of Royal Astronomical Society Volume: 印刷中
  • NAID: 120006313447
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On the effective turbulence driving mode of molecular clouds formed in disc galaxies (2017)
  • Author(s): Jin, Keitaro; Salim, Diane M.; Federrath, Christoph; Tasker, Elizabeth J.; Habe, Asao; Kainulainen, Jouni T.
  • Journal Title: Monthly Notices of Royal Astronomical Society Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] GMC evolution in a barred spiral galaxy with star formation and thermal feedback (2016)
  • Author(s): Fujimoto, Yusuke; Bryan, Greg L.; Tasker, Elizabeth J.; Habe, Asao; Simpson, Christine M.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 461 Issue: 2 Pages: 1684-1700
  • DOI: 10.1093/mnras/stw1461
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Isolating signatures of major cloud-cloud collisions - II. The lifetimes of broad bridge features (2015)
  • Author(s): Haworth, T. J.; Shima, K.; Tasker, E. J.; Fukui, Y.; Torii, K.; Dale, J. E.; Takahira, K.; Habe, A.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 454 Issue: 2 Pages: 1634-1643
  • DOI: 10.1093/mnras/stv2068
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Isolating signatures of major cloud-cloud collisions using position-velocity diagrams (2015)
  • Author(s): Haworth, T. J.; Tasker, E. J.; Fukui, Y.; Torii, K.; Dale, J. E.; Shima, K.; Takahira, K.; Habe, A.; Hasegawa, K.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 450 Issue: 1 Pages: 10-20
  • DOI: 10.1093/mnras/stv639
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 棒渦巻銀河の棒部における星形成の抑制3 (2018)
  • Author(s): 前田郁弥, 太田耕司 (京都大学), 羽部朝男 (北海道大学), 藤本裕輔 (ANU), 馬場淳一 (国立天文台)
  • Organizer: 日本天文学会
• [Presentation] 強い棒渦巻銀河NGC1300における星形成の抑制 (2018)
  • Author(s): 羽部朝男 (北海道大学), 藤本裕輔 (ANU), 前田郁弥, 太田耕司 (京都大学)
  • Organizer: 日本天文学会
• [Presentation] 強い棒渦巻銀河NGC1300における分子雲の性質 (2018)
  • Author(s): 前田郁弥, 太田耕司 (京都大学), 羽部朝男 (北海道大学), 藤本裕輔 (ANU), 馬場淳一 (国立天文台)
  • Organizer: 日本天文学会
• [Presentation] Study of effects of magnetic field in magnetized colliding molecular clouds. (2018)
  • Author(s): Nirmit Sakre, Asao Habe, Alex Pettitt (Hokkaido University)
  • Organizer: 日本天文学会
• [Presentation] Simulation Study of Cloud-cloud Collisions (2018)
  • Author(s): Asao Habe
  • Organizer: the workshop Shells, Clouds and Star Clusters in Prague
  • Int'l Joint Research / Invited
• [Presentation] 分子雲衝突による大質量コア形成シミュレーション (2018)
  • Author(s): 島和宏 (北大), Elizabeth J. Tasker (ISAS/JAXA), Christoph Federrath (ANU), 羽部朝男 (北大)
  • Organizer: 日本天文学会
• [Presentation] The effect of photoionising feedback on star formation in isolated and colliding turbulent clouds (2018)
  • Author(s): Kazuhiro Shima (Hokkaido University), Elizabeth J. Tasker (ISAS/JAXA), Christoph Federrath (ANU), Asao Habe (Hokkaido University)
  • Organizer: ALMA NA-Taiwan Joint Workshop, Magnetic Fields or Turbulence: Which is the critical factor for the formation of stars and planetary disks?
  • Int'l Joint Research
• [Presentation] 分子雲衝突による形成星にPhotoionizationフィードッバックが与える影響のシミュレーション (2017)
  • Author(s): 島和宏 (北大), Elizabeth J. Tasker (ISAS/JAXA), Christoph Federrath (ANU), 羽部朝男 (北大)
  • Organizer: 日本天文学会
• [Presentation] 分子雲衝突の3次元高解像度数値シミュレーション (2017)
  • Author(s): 島和宏, Elizabeth Tasker, 羽部朝男
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 九州大学（福岡県，福岡市）
• [Presentation] 分子雲衝突によるコア形成とHII領域の進化 (2016)
  • Author(s): 島和宏, Tasker, Elizabeth; Habe, Asao
  • Organizer: 日本天文学会
  • Place of Presentation: 首都大学東京(東京都八王子市)
  • Year and Date: 2016-03-15
• [Presentation] 分子雲衝突による大質量星形成 (2016)
  • Author(s): 羽部朝男
  • Organizer: 天文天体物理夏の学校
  • Place of Presentation: 千曲市（長野県，千曲市）
  • Invited
• [Presentation] 巨大分子雲の進化における分子雲衝突の役割 (2016)
  • Author(s): 島和宏, Elizabeth Tasker, 羽部朝男
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学（愛媛県，松山市）
• [Presentation] 分子雲衝突による星形成にUVフィードバックが与える影響のシミュレーションII (2015)
  • Author(s): 島和宏, Tasker, Elizabeth; Habe, Asao
  • Organizer: 日本天文学会
  • Place of Presentation: 甲南大学(兵庫県神戸市)
  • Year and Date: 2015-09-11
• [Presentation] Role of Cloud Cloud Collisions in High Mass Star Formation (2015)
  • Author(s): Asao HABE
  • Organizer: Life-cycle of gas in galaxies: A Local Perspective
  • Place of Presentation: Dwingeloo, the Netherlands
  • Year and Date: 2015-08-31
  • Int'l Joint Research
• [Presentation] From cloud crash to star birth: star formation in cloud collisions (2015)
  • Author(s): Shima, Kazuhiro; Tasker, Elizabeth; Habe, Asao
  • Organizer: IAU General Assembly,
  • Place of Presentation: ホノルル，アメリカ合衆国
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] Cloud Cloud Collision and Massive Star Formation (2015)
  • Author(s): Asao HABE
  • Organizer: Star Formation 2015: From Clouds to Cores
  • Place of Presentation: 国立天文台，(東京都，三鷹市)
  • Year and Date: 2015-06-29
  • Int'l Joint Research / Invited
• [Remarks] オリオン大星雲：分子雲衝突による巨大星形成を立証 （名古屋大学、国立天文台、京都大学との共同研究）
  • URL: https://astro3.sci.hokudai.ac.jp/~habe/wp/index.php/page-75/