Study of Magnetic Field Structure in Massive Star-forming Regions

• Project/Area Number: 16H05730
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Astronomy
• Research Institution: Nagoya City University
• Principal Investigator: Sugitani Koji 名古屋市立大学, 大学院システム自然科学研究科, 教授 (80192615)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: 星間磁場 / 大質量星形成 / 分子雲 / 近赤外線偏光観測 / 大質量形成領域 / 星形成 / 光学赤外線天文学 / 大質量星形成領域 / 星間偏光 / 大質量星 / 星団形成 / 赤外線暗黒星雲 / 巨大分子雲

Outline of Final Research Achievements

How massive stars are formed is one of the important issues in current astronomy research, however it is not well understood. In particular, it is not clear how the interstellar magnetic field is related to the formation of massive stars in giant molecular clouds. Therefore, the magnetic field structures of giant molecular clouds with massive stars and those without massive stars were investigated by near-infrared polarization observations, in order to examine their magnetic filed structures in comparison with their density structures. As a result, we found that massive stars are formed in the region where the magnetic field is relatively weak with respect to column density, whereas only low- and intermediate-masse stars are formed in the region where the magnetic field is relatively strong. This suggests that the magnetic field controls the mass of the star formed.

Academic Significance and Societal Importance of the Research Achievements

天文衛星「プランク」により全天域でサブミリ波偏光観測で星間磁場が調べられているが、その角分解能は十分でなく巨大分子雲の局所的な磁場構造を調べるのに十分でなかった。より高い角分解で磁場構造を調べることができる近赤外線偏光観測は従来から行われていたが観測範囲が狭く、巨大分子雲の全体を詳細に調べた例はほとんどなかった。本研究では、いくつかの巨大分子雲の全体の磁場構造を近赤外線偏光観測で詳細に調べることにより、星間磁場が星形成に重要な影響を与えていることを観測的に示した。このことは、星形成の研究分野に重要な知見を与えたと考えられる。

Research Products

• [Journal Article] Cloud structures in M17 SWex : Possible cloud-cloud collision (2020)
  • Author(s): Kinoshita, S. Nakamura, F., Nguyen-Luong, Q., Wu, B., Shimoikura, T., Sugitani, K., Dobashi, K., Takemura, H., Sanhueza, P., Kim, K., Kang, H., Evans, N.J.; White, G., Fallscheer, C.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Near-IR imaging polarimetry of the RCW 106 cloud complex (2020)
  • Author(s): Tamaoki, S., Sugitani, K., Kusune, T.
  • Journal Title: Astronomy in Focus XXX, presented at IAU XXX General Assembly, Vienna, Austria. Proceedings of the IAU, 2020 Volume: なし Issue: A30 Pages: 109-109
  • DOI: 10.1017/s1743921319003648
• [Journal Article] 大質量星形成領域 M17 ―野辺山星形成レガシープロジェクト (2020)
  • Author(s): 杉谷光司
  • Journal Title: 天文月報 (７月号） Volume: 113（印刷中）
• [Journal Article] Magnetic field structure in Serpens South (2019)
  • Author(s): Kusune Takayoshi、Nakamura Fumitaka、Sugitani Koji、Sato Shuji、Tamura Motohide、Kwon Jungmi、Dobashi Kazuhito、Shimoikura Tomomi、Wu Benjamin
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: Supplement_1
  • DOI: 10.1093/pasj/psz040
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Near-infrared imaging polarimetry toward M-17 SWex (2019)
  • Author(s): Sugitani Koji、Nakamura Fumitaka、Shimoikura Tomomi、Dobashi Kazuhito、Nguyen-Luong Quang、Kusune Takayoshi、Nagayama Takahiro、Watanabe Makoto、Nishiyama Shogo、Tamura Motohide
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: Supplement_1
  • DOI: 10.1093/pasj/psz072
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Stability of Massive Star-forming Clumps in RCW 106 (2019)
  • Author(s): Tamaoki, S., Sugitani, K., Nguyen-Luong, Q., Nakamura, F., Kusune, T., Nagayama, T., Watanabe, M., Nishiyama, S., Tamura, M.
  • Journal Title: The Astrophysical Journal Letters Volume: 875 Issue: 2 Pages: L16-L16
  • DOI: 10.3847/2041-8213/ab1346
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Field Structure in Serpens South (2019)
  • Author(s): Kusune,T., Nakamura, F., Sugitani, K., Sato, S., Tamura, M., Kwon,J., Dobashi, K., Shimoikura, t., Wu, B.
  • Journal Title: Publications of Astronomical Society of Japan Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Field of the Vela C Molecular Cloud (2016)
  • Author(s): Kusune, T., Sugitani, K., Nakamura, F., Watanabe, M., Tamura, M., Kwon, J., Sato, S.
  • Journal Title: The Astrophysical Journal Letters Volume: 830 Issue: 2 Pages: 23-29
  • DOI: 10.3847/2041-8205/830/2/l23
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 星形成レガシープロジェクトIII:M17 SWex分子雲の磁場構造 (2019)
  • Author(s): 杉谷光司、中村文隆、下井倉ともみ、土橋一仁、Nguyen-Luong, Quang、楠根貴成、永山貴宏、渡 邉誠、西山正吾、田村元秀
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] 大質量星形成領域RCW106分子雲の近赤外線撮像偏光観測 (2019)
  • Author(s): 玉置 捷平 他
  • Organizer: 2018年度IRSF勉強会
• [Presentation] Near-IR imaging polarimetry toward RCW106 (2018)
  • Author(s): Tamaoki, S, Sugitani, K., Kusune, T.
  • Organizer: XXXth General Assembly of the International Astronomical Union, Focus Meeting FM4:Magnetic fields along the star-formation sequence
  • Int'l Joint Research
• [Presentation] 大質量星形成領域 RCW106 分子雲の近赤外線偏光観測 (2018)
  • Author(s): 玉置捷平, 杉谷光司, 楠根貴成 他
  • Organizer: 日本天文学会2018年秋季年会
• [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、SIRPOL チーム
  • Organizer: 日本天文学会2018年秋季年会
• [Presentation] RCW106分子雲のSIRPOLによる偏光観測 (2018)
  • Author(s): 玉置捷平、杉谷光司、楠根貴成、Quang Nguyen、 他
  • Organizer: IRSF勉強会、名古屋大学理学部、3月５日
• [Presentation] Vela C 分子雲の近赤外線偏光観測 (2017)
  • Author(s): 楠根貴成、中村文隆、杉谷光司、SIRPOLチーム
  • Organizer: 日本天文学会2017年秋季年会、北海道大学、9月11～13日
• [Presentation] Near-IR imaging polarimetry toward RCW 106 (2017)
  • Author(s): Shohei Tamaoki, Koji Sugitani, Takayoshi Kusune
  • Organizer: East Asia Young Astronomers Meeting EAYAM2017, Ishigaki Iland, Japan, Nov. 13-16, 2017
  • Int'l Joint Research
• [Presentation] Near-Infrared Polarimetric Observations of the Nessie Nebula (2016)
  • Author(s): Sugitani, K., Kusune, T., Nakamura, F., Nishiyama, S., and SIRPOL Team
  • Organizer: Star Formation in Different Environments
  • Place of Presentation: Quy Nhon, Viet Nam
  • Year and Date: 2016-07-25
  • Int'l Joint Research
• [Presentation] 赤外線暗黒星雲 “ネッシー” 星雲の近赤外線偏光観測 (2016)
  • Author(s): 杉谷光司、楠根貴成、中村文隆、西山正吾、SIRPOL チーム他
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学
• [Presentation] Vela C 分子雲の磁場構造 (2016)
  • Author(s): 楠根貴成、杉谷光司、中村文隆、SIRPOL チーム他
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学