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Lifetime of spiral structures in nearby galaxies

Research Project

Project/Area Number 17K14259
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionThe University of Tokyo (2018-2023)
National Astronomical Observatory of Japan (2017)

Principal Investigator

EGUSA Fumi  東京大学, 大学院理学系研究科(理学部), 准教授 (30644843)

Project Period (FY) 2017-04-01 – 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 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords渦巻銀河 / 電波天文学
Outline of Final Research Achievements

For one nearby barred spiral galaxy, we obtained a stellar mass distribution map by fitting a model to multi-wavelength data. Based on this map, we succeeded in determining spiral arm regions in the inner part of the galactic disk. With these defined regions, we investigated the impact of galactic structures on interstellar molecular gas.
Meanwhile, in another nearby barred spiral galaxy, we analyzed radio emission lines from interstellar molecular gas and found that their ratios depend on the location and velocity components. This result indicates that the environments within the galaxy affect the physical conditions (temperature and density) of interstellar molecular gas.

Academic Significance and Societal Importance of the Research Achievements

渦巻銀河における星質量分布は、銀河円盤の重力ポテンシャル分布に相当する。重力ポテンシャルに対する星間ガスの応答は、渦巻腕構造の起源を理解する上で重要だが、星質量分布は単一波長の観測データだけでは導出できないという問題があった。そこで我々はモデルと多波長データを利用して、星質量分布の導出に成功した。当初の目的であった腕構造の寿命の決定には至らなかったが、腕構造が星間ガスに与える影響について一定の理解を得た。
一方、関連して開始した分子ガス輝線強度比の研究については、銀河を空間方向・速度方向に分解した議論を行い、銀河内の環境が星間分子ガスの物理状態に与える影響について詳細に調査できた。

Report

(8 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
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2018 2017 Other

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

  • [Int'l Joint Research] Stony Brook University(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Stony Brook University(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Stony Brook University(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Stony Brook University(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] CO Excitation and its Connection to Star Formation at 200 pc in NGC 13652022

    • Author(s)
      Egusa Fumi、Gao Yulong、Morokuma-Matsui Kana、Liu Guilin、Maeda Fumiya
    • Journal Title

      The Astrophysical Journal

      Volume: 935 Issue: 2 Pages: 64-64

    • DOI

      10.3847/1538-4357/ac8050

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] CO Excitation and its Connection to Star Formation and Dynamics in NGC 13652023

    • Author(s)
      Egusa, F., Gao, Y., Morokuma-Matsui, K., Liu, G., and Maeda, F.
    • Organizer
      APRIM2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CO excitation and its connection to star formation and outflow in NGC 13652022

    • Author(s)
      Fumi Egusa, Yulong Gao, Kana Morokuma-Matsui, Guilin Liu, Fumiya Maeda
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Stellar and Gas Mass Distributions for Understanding the Nature of Spiral Arms2018

    • Author(s)
      F. Egusa, E. Mentuch Cooper, J. Koda, J. Baba
    • Organizer
      (IAUS 341) PanModel2018: Challenges in Panchromatic Galaxy Modelling with Next Generation Facilities
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Funded Workshop] Asia-Pacific Regional IAU Meeting2017

    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2025-01-30  

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