Studies of Chemical Compositions of Cluster Forming Clumps

• Project/Area Number: 25400225
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Electro-Communications
• Principal Investigator: Sakai Takeshi 電気通信大学, 情報理工学(系)研究科, 助教 (20469604)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 星形成 / 星団 / 分子雲 / 星間分子 / 電波天文 / 大質量星 / 星団形成 / ミリ波

Outline of Final Research Achievements

We have observed a cluster forming clump (MM3) associated with the infrared dark cloud G34.43+00.24 with the Atacama Large Millimeter/submillimeter Array (ALMA). We have found a young outflow (age < ~1000 yr) and a hot core toward the center of this clump. The size of the hot core is found to be much larger than that of the typical low-mass hot corinos, suggesting a high accretion rate or the presence of multiple star system harboring a few hot corinos. We have also found highly deuterated regions toward the center of the clump, although the DNC/HNC ratio of this clump is very low in the observations with the single-dish Nobeyama 45 m telescope. We think that the DNC and HNC emission observed with the single-dish telescope traces lower density envelopes, while that observed with ALMA traces higher density and highly deuterated regions.

Research Products

• [Journal Article] ALMA Observations of of the IRDC Clump G34.43+00.24 MM3: DNC/HNC Ratio (2015)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Foster, J. B., Sanhueza, P., Jackson, J. M., Yamamoto, S.
  • Journal Title: The Astrophysical Journal Volume: 803 Issue: 2 Pages: 70-70
  • DOI: 10.1088/0004-637x/803/2/70
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] ALMA Observations of the IRDC Clump G34.43+00.24 MM3: 278 GHz Class I Methanol Masers (2014)
  • Author(s): Yanagida, T., Sakai, T., Hirota, T., Sakai, N., Foster, J. B., Sanhueza, P., Jackson, J. M., Furuya, K., Aikawa, Y., Yamamoto, S.
  • Journal Title: The Astrophysical Journal Letters Volume: 794 Issue: 1 Pages: L10-L10
  • DOI: 10.1088/2041-8205/794/1/l10
  • Peer Reviewed
• [Journal Article] DNC/HNC and N_2D^+/N_2H^+ ratios in high-mass star-forming cores (2014)
  • Author(s): Fontani, F., Sakai, T., Furuya, K., Sakai, N., Aikawa, Y., Yamamoto, S.
  • Journal Title: Monthly Notices of the Royal Astronomical Societ Volume: 440 Issue: 1 Pages: 448-456
  • DOI: 10.1093/mnras/stu298
  • Peer Reviewed
• [Journal Article] ALMA Observations of the IRDC clump G34.43+00.24 MM3 : hot core and molecular outflows (2013)
  • Author(s): Sakai, T., Sakai, N., Foster, J. B., Sanhueza, P., Jackson, J. M., Kassis, M., Furuya, K., Aikawa, Y., Hirata T., Yamamoto. S.
  • Journal Title: The Astrophysical Journal Letters Volume: 775 Issue: 1 Pages: 31-36
  • DOI: 10.1088/2041-8205/775/1/l31
  • Peer Reviewed
• [Presentation] 電波観測で探る大質量星形成過程 (2015)
  • Author(s): 酒井剛
  • Organizer: 宇宙・電磁環境センター研究集会
  • Place of Presentation: 電気通信大学, 東京
  • Year and Date: 2015-12-25
• [Presentation] Observational Studies of Initial Conditions for High-Mass Star Formation (2015)
  • Author(s): Sakai, T,
  • Organizer: East Asian ALMA Science Workshop 2015
  • Place of Presentation: I-site Nanba, Osaka
  • Year and Date: 2015-12-08
  • Int'l Joint Research / Invited
• [Presentation] IRDC G34.43+00.24 MM3 に付随した若いホットコアの化学組成 (2015)
  • Author(s): 酒井剛, 柳田貴大, 坂井南美, 古家健次, 相川祐理, 廣田朋也, Patricio Sanhueza, Jonathan B. Foster, James M. Jackson, 山本智
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学, 兵庫県
  • Year and Date: 2015-09-09
• [Presentation] Review of Observations of High-Mass Star Formation (2015)
  • Author(s): Sakai, T.
  • Organizer: NRO-ALMA Science/Development Workshop 2015
  • Place of Presentation: Nobeyama Radio Observatory, Nagano
  • Year and Date: 2015-07-28
  • Int'l Joint Research / Invited
• [Presentation] Deuterium Fractionation in Cluster Forming Clumps (2015)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Foster, J.B., Sanhueza, P., Jackson, J. M., Yamamoto, S.
  • Organizer: Star Formation 2015: From Clouds to Cores
  • Place of Presentation: National Astronomical Observatory of Japan, Tokyo
  • Year and Date: 2015-06-29
  • Int'l Joint Research / Invited
• [Presentation] DNC/HNC Ratio in Molecular Clumps (2015)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Foster, J.B., Sanhueza, P., Jackson, J. M., Yamamoto, S.
  • Organizer: The Soul of High-Mass Star Formation
  • Place of Presentation: Puerto Varas, Chile
  • Year and Date: 2015-03-16 – 2015-03-20
• [Presentation] DNC/HNC Ratio in the IRDC clump G34.43+00.24 MM3 (2014)
  • Author(s): Sakai, T., Sakai, N., Furuya, K., Aikawa, Y., Hirota, T., Foster, J.B., Sanhueza, P., Jackson, J. M., Yamamoto, S.
  • Organizer: Workshop on Interstellar Matter 2014
  • Place of Presentation: 北海道大学
  • Year and Date: 2014-10-16 – 2014-10-18
• [Presentation] ALMAによるIRDC clump G34.43+00.24 MM3に対するDNC/HNCの観測 (2014)
  • Author(s): 酒井剛, 坂井南美, 古家健次, 相川祐理, 廣田朋也, Jonathan B. Foster, Patricio Sanhueza, James M. Jackson, 山本智
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] ALMA望遠鏡によるIRDC Clump G34.43+00.24 MM3に対するClass I CH3OH メーザーの観測 (2014)
  • Author(s): 柳田貴大,酒井剛,廣田朋也,坂井南美,Jonathan B. Foster, Patricio Sanhueza,James M. Jackson,古家健次, 相川祐理,山本智
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] ALMA Observations of the IRDC Clump G34.43+00.24 MM3 (2014)
  • Author(s): Sakai, T., Sakai, N., Foster, J. B., Sanhueza, P., Jackson, J. M., Kassis, M., Furuya, K., Aikawa, Y., Hirota, T., Yamamoto, S.
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 国際基督教大学
• [Presentation] 70 GHz帯SIS素子の開発 (2014)
  • Author(s): 酒井剛、池谷瑞基、野口卓
  • Organizer: 第14回ミリ波サブミリ波受信機ワークショップ
  • Place of Presentation: 茨城大学