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The role of magnetic fields in the phase transition process of interstellar medium driven by the dynamic stellar system spiral arms

Research Project

Project/Area Number 19K03929
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Iwasaki Kazunari  国立天文台, 天文シミュレーションプロジェクト, 助教 (50750379)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords分子雲 / 星形成 / 磁気流体力学 / 恒星系力学 / 磁場 / 重力多体系 / 粒子多体系 / 渦状腕 / 銀河 / 銀河渦状腕 / 星間媒質 / 熱的不安定性
Outline of Research at the Start

銀河における星間媒質の進化(特に分子雲の形成と進化) において,磁場の果たす役割はよくわかっていない。分子雲形成は大局的な星間媒質の進化の中で起こるため,銀河円盤において,星間媒質と磁場がどう相互作用して進化するのかを明らかにする必要がある。そこで本研究では,星間媒質の大局運動に決定的な役割を果たす恒星系渦状腕を考慮した現実的な銀河モデルにおいて,星間媒質の進化(原子ガスから分子雲への進化) における磁場の役割を,分子雲の内部構造を分解した高解像度磁気流体計算により明らかにする。これにより星形成における磁場の役割の解明に向けて,現実的な銀河モデルに基づいた分子雲形成・進化シナリオを提供する。

Outline of Final Research Achievements

In this study, local simulations considering detailed physical processes were performed to investigate the formation and evolution of molecular clouds. We found that while the global physical properties of molecular clouds strongly depend on their formation environment, the statistical properties of high-density regions where star are born show a universal relationship. This finding may explain observational features where molecular clouds in various physical states show a universal stellar initial function. Furthermore, to take into account galactic-scale processes, a galactic stellar system, which drives galactic spiral arms, was implemented into the publically available simulation code, Athena++. This implementation successfully reduces numerical self-force exerting on stars near boundaries of different resolutions.

Academic Significance and Societal Importance of the Research Achievements

星は宇宙の基本的構成要素で,その形成過程を理解することは,宇宙進化を解明するうえで必要不可欠である。本研究は星形成の場である分子雲形成の局所プロセスを可能な限り第一原理から調査することで,形成される分子雲の多様性と,星形成に至る物理過程の普遍性を明らかにした。星形成の初期条件解明の第一歩となった。また本研究において,銀河スケールのプロセスが分子雲形成を始めとする星間媒質の進化へ与える影響を明らかにするために開発した恒星系多体系モジュールは将来的に公開を目指しており,天文コミュニティでこのコードが共有されることにより,多様な物理過程を考慮したシミュレーションがさらに発展すると期待される。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (13 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 13 results,  Open Access: 13 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Remarks (3 results) Funded Workshop (1 results)

  • [Int'l Joint Research] ネバダ大学(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Simulation of Head-on Collisions between Filamentary Molecular Clouds Threaded by a Lateral Magnetic Field and Subsequent Evolution2023

    • Author(s)
      Kashiwagi Raiga、Iwasaki Kazunari、Tomisaka Kohji
    • Journal Title

      The Astrophysical Journal

      Volume: 954 Issue: 2 Pages: 129-129

    • DOI

      10.3847/1538-4357/ace7bd

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Metallicity Dependence of Molecular Cloud Hierarchical Structure at Early Evolutionary Stages2023

    • Author(s)
      Kobayashi Masato I. N.、Iwasaki Kazunari、Tomida Kengo、Inoue Tsuyoshi、Omukai Kazuyuki、Tokuda Kazuki
    • Journal Title

      The Astrophysical Journal

      Volume: 954 Issue: 1 Pages: 38-38

    • DOI

      10.3847/1538-4357/ace34e

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Universal Properties of Dense Clumps in Magnetized Molecular Clouds Formed through Shock Compression of Two-phase Atomic Gases2022

    • Author(s)
      Iwasaki Kazunari、Tomida Kengo
    • Journal Title

      The Astrophysical Journal

      Volume: 934 Issue: 2 Pages: 174-174

    • DOI

      10.3847/1538-4357/ac75cc

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nature of Supersonic Turbulence and Density Distribution Function in the Multiphase Interstellar Medium2022

    • Author(s)
      Kobayashi Masato I. N.、Inoue Tsuyoshi、Tomida Kengo、Iwasaki Kazunari、Nakatsugawa Hiroki
    • Journal Title

      The Astrophysical Journal

      Volume: 930 Issue: 1 Pages: 76-76

    • DOI

      10.3847/1538-4357/ac5a54

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] B-fields in star-forming region observations (BISTRO): magnetic fields in the filamentary structures of Serpens Main2022

    • Author(s)
      W. Kwon, K. Pattle, S. Sadavoy, 他
    • Journal Title

      The Astrophysical Journal

      Volume: 926 Issue: 2 Pages: 163-163

    • DOI

      10.3847/1538-4357/ac4bbe

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The JCMT BISTRO Survey: 950/450 micron meter polarization study toward NGC 2071IR in Orion B2021

    • Author(s)
      A. Lyo, J. Kim, S. Sadavo, 他
    • Journal Title

      The Astrophysical Journal

      Volume: 918 Issue: 2 Pages: 85-85

    • DOI

      10.3847/1538-4357/ac0ce9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-22021

    • Author(s)
      Ngoc Nguyen Bich、他、including Kohji Tomisaka
    • Journal Title

      The Astrophysical Journal

      Volume: 908 Issue: 1 Pages: 10-10

    • DOI

      10.3847/1538-4357/abd0fc

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dust polarized emission observations of NGC 63342021

    • Author(s)
      Arzoumanian D.、Furuya R. S.、Hasegawa T.、Tahani M.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 647 Pages: A78-A78

    • DOI

      10.1051/0004-6361/202038624

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 13332020

    • Author(s)
      Doi Yasuo、Hasegawa Tetsuo、Furuya Ray S.、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 899 Issue: 1 Pages: 28-28

    • DOI

      10.3847/1538-4357/aba1e2

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Bimodal Behavior and Convergence Requirement in Macroscopic Properties of the Multiphase Interstellar Medium Formed by Atomic Converging Flows2020

    • Author(s)
      Kobayashi Masato I. N.、Inoue Tsuyoshi、Inutsuka Shu-ichiro、Tomida Kengo、Iwasaki Kazunari、Tanaka Kei E. I.
    • Journal Title

      The Astrophysical Journal

      Volume: 905 Issue: 2 Pages: 95-95

    • DOI

      10.3847/1538-4357/abc5be

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 51462019

    • Author(s)
      Wang Jia-Wei、Lai Shih-Ping、Eswaraiah Chakali et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 876 Issue: 1 Pages: 42-42

    • DOI

      10.3847/1538-4357/ab13a2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region2019

    • Author(s)
      Coude Simon、Bastien Pierre、Houde Martin、Sadavoy Sarah、... Tomisaka Kohji、...、The B-fields In STar-forming Regions Observations (BISTRO) Collaboration
    • Journal Title

      The Astrophysical Journal

      Volume: 877 Issue: 2 Pages: 88-88

    • DOI

      10.3847/1538-4357/ab1b23

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The JCMT BISTRO Survey: The magnetic field in the starless core rho Ophiuchus C2019

    • Author(s)
      Liu, J., Qiu, K., Berry, D., Francesco, J. D., et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 877 Issue: 1 Pages: 43-43

    • DOI

      10.3847/1538-4357/ab0958

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Physical Properties of Dense Clumps and Cores in Magnetized Molecular Clouds Formed through Accumulation of HI clouds2024

    • Author(s)
      Kazunari Iwasaki
    • Organizer
      Magnetic Fields from Clouds to Stars (Bfields-2024)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of Particle-Mesh Method for Self-gravity in Athena++2023

    • Author(s)
      Kazunari Iwasaki
    • Organizer
      Athena++ Workshop 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Universal Properties of Dense Clumps in Magnetized Molecular Clouds2023

    • Author(s)
      Kazunari Iwasaki
    • Organizer
      Protostars and Planets VII
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 分子雲形成・進化シミュレーション:高密度クランプの重力不安定条件2022

    • Author(s)
      岩﨑一成
    • Organizer
      日本天文学会春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 分子雲形成シミュレーションで探る重力的に束縛された高密度クランプの統計的性質2021

    • Author(s)
      岩崎 一成、富田賢吾
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 分子雲形成に伴う多相流体ダイナミクス2021

    • Author(s)
      岩崎 一成
    • Organizer
      国立天文台研究集会 (サブ)ミリ波単一鏡の革新で挑む, 天文学の未解決問題
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] SPICAで探る分子雲の多相構造2020

    • Author(s)
      岩崎一成
    • Organizer
      日本天文学会2020年春季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] The formation of molecular clouds by compression of two-phase atomic gases2020

    • Author(s)
      岩崎一成
    • Organizer
      16th Rencontres du Vietnam: Magnetic Field in the Universe 7
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 分子雲形成シミュレーション:自己重力の効果2019

    • Author(s)
      岩崎一成
    • Organizer
      日本天文学会2019年秋季年会、熊本大学
    • Related Report
      2019 Research-status Report
  • [Remarks] ホームページ

    • URL

      https://www.cfca.nao.ac.jp/~kiwasaki/study.html

    • Related Report
      2023 Annual Research Report
  • [Remarks]

    • URL

      https://www.cfca.nao.ac.jp/~kiwasaki/study.html

    • Related Report
      2022 Research-status Report
  • [Remarks]

    • URL

      https://www.cfca.nao.ac.jp/~kiwasaki/study_gyouseki.html

    • Related Report
      2019 Research-status Report
  • [Funded Workshop] Magnetic Fields from Clouds to Stars (Bfields-2024)2024

    • Related Report
      2023 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2025-01-30  

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