Exploring the timescale for high-mass star formation through deuterium fractionation ratios

2012 Fiscal Year Final Research Report

• Project/Area Number: 23740146
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: SAKAI Takeshi 東京大学, 大学院・理学系研究科, 特任助教 (20469604)
• Project Period (FY): 2011 – 2012
• Keywords: 電波天文 / 分子雲 / 星形成 / 大質量星 / 重水素 / 星間分子 / ミリ波

Research Abstract

We have investigated the timescale of high-mass starless core phase from the deuterium fractionation rations in massive clumps. We have observed the HNC and HN13C lines toward the massive clumps, including infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), with the Nobeyama Radio Observatory 45 m telescope. We have found that the DNC/HNC ratio of the massive clumps is lower than that of the low-mass cores. This suggests that the timescale of high-mass starless phase is shorter than that of low-mass starless phase. By comparing with the model calculations, we have found that the timescale of high-mass starless phase is shorter than several times 104 yr.

Research Products

• [Journal Article] DNC/HNC Ratio of Massive Clumps in Early Evolutionary Stages of High-mass Star Formation (2012)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Yamamoto, S.
  • Journal Title: The Astrophysical Journal Volume: Volume 747 Pages: 140
  • Peer Reviewed
• [Presentation] 野辺山45m望遠鏡用70GHz帯受信機の搭載と140GHz帯受信機の開発 (2013)
  • Author(s): 酒井剛
  • Organizer: 第13回ミリ波サブミリ波受信機ワークショ ップ
  • Place of Presentation: 名古屋
  • Year and Date: 20130227-28
• [Presentation] Chemical Compositions of Massive Clumps in Early Evolutionary Stages of High-Mass Star Formation (2012)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Yamamoto, S.
  • Organizer: New Trends in Radio Astronomy in the ALMA Era
  • Place of Presentation: Hakone, Japan
  • Year and Date: 20121203-08
• [Presentation] 野辺山45m望遠鏡用70GHz帯受信機の開発 (2011)
  • Author(s): 酒井剛、柴田大輝、渡辺祥正、坂井南美、山本智、河野孝太郎、藤井由美、野口卓、浅山信一郎、中島拓、廣田朋也、高野秀路、木村公洋、前澤裕之
  • Organizer: 日本天文学会2011年秋季年会
  • Place of Presentation: 鹿児島
  • Year and Date: 20110919-22
• [Presentation] Deuterium Fractionation in Massive Clumps in Early Evolutionary Stages of High- Mass Star Formation (2011)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Yamamoto, S.
  • Organizer: The Molecular Universe
  • Place of Presentation: Toledo, Spain
  • Year and Date: 20110530-0603
• [Presentation] 野辺山45m望遠鏡用70GHz帯140GHz帯受信機について (2011)
  • Author(s): 酒井剛
  • Organizer: 第12回ミリ波サブミリ波受信機ワークショップ
  • Place of Presentation: 大阪
  • Year and Date: 2011-11-19