Investigating high-mass star formation through chemical compositions of infrared dark clouds

2010 Fiscal Year Final Research Report

• Project/Area Number: 21740144
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: SAKAI Takeshi The University of Tokyo, 大学院・理学系研究科, 特任助教 (20469604)
• Project Period (FY): 2009 – 2010
• Keywords: 電波天文学 / 星間物質 / 星間分子 / 赤外暗黒雲 / 大質量星形成

Research Abstract

We have investigated the high-mass star formation on the basis of the chemical compositions of infrared dark clouds (IRDCs), which are thought to be in early evolutionary stages of high-mass star formation. For this purpose, we have carried out a survey of molecular lines toward massive clumps associated with infrared dark clouds (IRDCs) by using the Nobeyama Radio Observatory 45 m telescope and the ASTE 10 m telescope. We have found that the SiO and CH_3OH abundances relative to H^<13>CO^+ are enhanced in several IRDC clumps. Since SiO and CH_3OH are known as "shock tracers", this results means that an interaction between outflows and dense gas frequently occurs in early evolutionary stages of high-mass star formation. The data obtained are useful for future high-resolution observations.

Research Products

• [Journal Article] 野辺山45m望遠鏡100GHz帯受信機のIF広帯域化 (2011)
  • Author(s): 酒井剛、岩下浩幸、中島拓、伊王野大介、高野秀路、久野成夫、川辺良平、河野孝太郎、山本智
  • Journal Title: 2011年日本天文学会春期年会予稿集 1
• [Journal Article] ASTEチーム、"Band 8 QM受信機のASTE望遠鏡への搭載" (2011)
  • Author(s): 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, 他
  • Journal Title: 2011年日本天文学会春期年会予稿集 1
• [Journal Article] A Survey of Molecular Lines toward Massive Clumps in Early Stages of High-Mass Star Formation (2010)
  • Author(s): Sakai, T., Sakai, N., Hirota, T., Yamamoto, S.
  • Journal Title: the Astrophysical Journal 714 Pages: 1658-1671
  • Peer Reviewed
• [Presentation] ASTE 350GHz帯受信機の性能向上 (2011)
  • Author(s): 酒井剛、藤井由美、野口卓、井上裕文、河野孝太郎
  • Organizer: 2010年日本天文学会秋季年会
  • Place of Presentation: 金沢
  • Year and Date: 20110900
• [Presentation] Infrared dark clouds について (2010)
  • Author(s): 酒井剛
  • Organizer: 第6回星形成ワークショップ
  • Place of Presentation: 東京
  • Year and Date: 20101100
• [Presentation] DNC/HNC Ratio in High-Mass Star Forming Regions : Probing the Initial Condition of High-mass Star Formation (2010)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Yamamoto, S.
  • Organizer: Submillimeter and THz Astrochemistry
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 20100317-20100318
• [Presentation] DNC/HNC Ratio in High-Mass Star Forming Regions (2009)
  • Author(s): Sakai, T., Sakai, N., Hirota, T., Shiba, S., Yamamoto, S.
  • Organizer: Millimeter and Submillimeter Astronomy at High Angular Resolution
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 20090608-20090612