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The evolution of cluster member galaxies based on a systematic search of proto-clusters

Research Project

Project/Area Number 19K03924
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 Tokyo

Principal Investigator

Shimasaku Kazuhiro  東京大学, 大学院理学系研究科(理学部), 准教授 (00251405)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords銀河 / 銀河団 / 銀河の進化
Outline of Research at the Start

銀河は宇宙空間にばらばらに分布しているのではなく、一部は銀河団と呼ばれる集団に属している。興味深いことに、現在の宇宙では、銀河団に属しているかどうかで銀河の性質が大きく異なっている。この違いがいつどのように発生したのかを明らかにするには、過去の銀河団、すなわち原始銀河団の観測が必要である。本研究は、原始銀河団の系統的な探査法を開発し、銀河団の形成期 (現在から100億年以上前) における銀河と銀河団の関係を調べる。

Outline of Final Research Achievements

In the present-day universe, galaxies in clusters are quenched while those in the general field are still forming stars. When and how clusters galaxies are quenched is a key issue to understanding the evolution of galaxies. We apply novel cluster-finding method to wide-field galaxy data to find many proto-clusters and investigate the properties of member galaxies. We find that quenched members are already in place in the universe of 2-4 giga years old and that more massive galaxies are more likely to be quenched.

Academic Significance and Societal Importance of the Research Achievements

学術的意義を2点挙げる。1. これまでの原始銀河団の研究の多くは曖昧な定義に基づいて探査された原始銀河団を用いていたため、得られた結果の普遍性に問題があった。またそもそも原始銀河団の数も十分ではなかった。それに対して本研究は、定量的かつ客観的な探査法を開発して、それを広天域の銀河データに適用し、約20億歳という若い宇宙までカバーした、均質かつ大規模な原始銀河団サンプルを作成した。2. 星形成をやめた銀河が約20-40億歳という若い時代に既に存在することを明らかにした。

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

    (15 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] Saint Mary’s University(カナダ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Saint Mary’s University(カナダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ASIAA(その他の国・地域 (台湾))

    • Related Report
      2021 Research-status Report
  • [Journal Article] X-ray stacking reveals average SMBH accretion properties of star-forming galaxies and their cosmic evolution over 4 ? <i>z</i> ? 72024

    • Author(s)
      Matsui Suin、Shimasaku Kazuhiro、Ito Kei、Ando Makoto、Tanaka Takumi S
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 529 Issue: 2 Pages: 926-940

    • DOI

      10.1093/mnras/stad3955

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detection of anisotropic satellite quenching in galaxy clusters up to z ~ 12023

    • Author(s)
      Ando, M., Shimasaku, K., Ito, K.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 519 Issue: 1 Pages: 13-25

    • DOI

      10.1093/mnras/stac3251

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A systematic search for galaxy protocluster cores at the transition epoch of their star formation activity2022

    • Author(s)
      Ando, M. Shimasaku, K., Momose, R., Ito, K., Sawicki, M., Shimakawa, R.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 513 Issue: 3 Pages: 3252-3272

    • DOI

      10.1093/mnras/stac1049

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Environmental Dependence of Galactic Properties Traced by Lyα Forest Absorption: Diversity among Galaxy Populations2021

    • Author(s)
      Momose, R., Shimasaku, K. et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 909 Issue: 2 Pages: 117-117

    • DOI

      10.3847/1538-4357/abd2af

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A systematic search for galaxy proto-cluster cores at z~22020

    • Author(s)
      Ando, M., Shimasaku, K., Momose, R.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 496 Issue: 3 Pages: 3169-3181

    • DOI

      10.1093/mnras/staa1757

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] The average SMBH accretion properties of star-forming galaxies and their cosmic evolution over 4<~z<~72023

    • Author(s)
      Matsui, S., Shimasaku, K., Ito, K., Ando, M., Tanaka, T. S.
    • Organizer
      HSC-AGN collaboration meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Detection of the anisotropic satellite galaxy quenching in clusters up to z ~ 12022

    • Author(s)
      Makoto Ando, Kazuhiro Shimasaku, Kei Ito, Takumi Tanaka, John D. Silverman, Suin Matsui et al.
    • Organizer
      日本天文学会
    • Related Report
      2022 Research-status Report
  • [Presentation] A systematic search for proto-cluster cores at a transition epoch of star formation activity2021

    • Author(s)
      Makoto Ando, Kazuhiro Shimasaku et al.
    • Organizer
      Galaxy Cluster Formation II (GCF 2021) - Virtual Workshop
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] A systematic search for galaxy protocluster cores at the transition epoch of star formation activity2021

    • Author(s)
      Makoto Ando, Kazuhiro Shimasaku et al.
    • Organizer
      日本天文学会2021年秋季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] A systematic search for galaxy protocluster cores at z~22020

    • Author(s)
      Ando, M., Shimasaku, K., Momose, R.
    • Organizer
      Protoclusters: Galaxies in Confinement
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Systematic Search for Galaxy Proto-cluster Cores at z ~ 22020

    • Author(s)
      Ando, M., Shimasaku, K., Momose, R.
    • Organizer
      IAU Symp. 359, Galaxy evolution and feedback across different environments
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 多波長データに基づく z ~ 2 の原始銀河団コアに属する銀河の性質2019

    • Author(s)
      安藤誠、嶋作一大
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2019 Research-status Report

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

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