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Exploring the Origin of Nitrogen-Containing Complex Organic Molecules in High-Mass Star-Forming Regions with ALMA

Research Project

Project/Area Number 20K04025
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionThe University of Electro-Communications

Principal Investigator

Sakai Takeshi  電気通信大学, 大学院情報理工学研究科, 教授 (20469604)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords大質量星 / 星間分子 / 有機分子 / 赤外線暗黒星雲 / 星形成 / 分子雲 / 重水素 / 重水素化分子 / 電波天文 / ALMA
Outline of Research at the Start

アルマ望遠鏡による分子輝線観測によって、大質量星形成の極初期段階にあると考えられる原始星周囲の化学組成を統計的に調べ、それらを他の進化の進んだ大質量星形成領域や小質量星形成領域における存在量と比較する。小質量形成領域と大質量星形成とで原始星周囲の化学組成がことなることが知られているが、本観測によって、化学組成(特に窒素を含む複雑な有機分子の存在量)が大質量星形成のどの段階から、小質量星形成領域と異なっているのか明らかにする。

Outline of Final Research Achievements

In order to investigate the origin of nitrogen-bearing complex organic molecules in high-mass star-forming regions, we observed high-mass star-forming regions at various evolutionary stages by using ALMA. The observations of the deuterated molecular lines revealed that there is diversity in the initial conditions of high-mass star formation and that the temperature of the initial conditions of high-mass star formation can be higher than that of low-mass star formation. In addition, it was found that the abundance of nitrogen-bearing complex organic molecules varies among the observed high-mass star-forming regions, and this variation is likely due to differences in the properties after star formation rather than differences in the initial conditions before star formation. It is suggested that the heating process of dust is related to the origin of nitrogen-containing complex organic molecules in high-mass star-forming regions.

Academic Significance and Societal Importance of the Research Achievements

分子雲内部で原始星が誕生し惑星が形成される過程で、物質がどのように進化してきたのか理解することは、我々がどのように誕生してきたかという根源的な問いに直結する重要な研究テーマである。複雑な有機分子の起源を明らかにすることは、アミノ酸など生命関連分子の生成過程の理解にもつながる。本研究では、大質量星形成領域における窒素を含む複雑な有機分子の存在量には、ダストの加熱過程が影響している可能性を示した。今後、さらに研究を進めることで、生命関連分子の生成過程の理解も進むと期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2024 2023 2022 2020 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results)

  • [Int'l Joint Research] Universite de Toulouse/Universite Grenoble Alpes(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Korea Astronomy and Space Science Inst.(韓国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Shanghai Astronomical Observatory(中国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Harvard & Smithsonian(米国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] FAUST2024

    • Author(s)
      Vastel C.、Sakai T.、Ceccarelli C.、Jim?nez-Serra I.、Alves F.、Balucani N.、Bianchi E.、Bouvier M.、Caselli P.、Chandler C. J.、Charnley S.、Codella C.、De Simone M.、Dulieu F.、Evans L.、Fontani F.、Lefloch B.、Loinard L.、Menard F.、Podio L.、Sabatini G.、Sakai N.、Yamamoto S.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 684 Pages: A189-A189

    • DOI

      10.1051/0004-6361/202348481

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). V. Deuterated Molecules in the 70 μm Dark IRDC G14.492-00.1392022

    • Author(s)
      Sakai Takeshi、Sanhueza Patricio、Furuya Kenji、Tatematsu Ken’ichi、Li Shanghuo、Aikawa Yuri、Lu Xing、Zhang Qizhou、Morii Kaho、Nakamura Fumitaka、Takemura Hideaki、Izumi Natsuko、Hirota Tomoya、Silva Andrea、Guzman Andres E.、Sakai Nami、Yamamoto Satoshi
    • Journal Title

      The Astrophysical Journal

      Volume: 925 Issue: 2 Pages: 144-144

    • DOI

      10.3847/1538-4357/ac3d2e

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). II. Molecular Outflows in the Extreme Early Stages of Protocluster Formation2020

    • Author(s)
      Li Shanghuo、Sanhueza Patricio、Zhang Qizhou、Nakamura Fumitaka、Lu Xing、Wang Junzhi、Liu Tie、Tatematsu Ken’ichi、Jackson James M.、Silva Andrea、Guzm?n Andr?s E.、Sakai Takeshi、Izumi Natsuko、Tafoya Daniel、Li Fei、Contreras Yanett、Morii Kaho、Kim Kee-Tae
    • Journal Title

      The Astrophysical Journal

      Volume: 903 Issue: 2 Pages: 119-119

    • DOI

      10.3847/1538-4357/abb81f

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ALMA を用いた大質量星形成領域に対する化学組成のサーベイ観測2023

    • Author(s)
      塩村信人、酒井剛(電気通信大学)、Patricio Sanhueza (国立天文台)
    • Organizer
      日本天文学会2023年春季年会
    • Related Report
      2022 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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