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Construction of Galaxy Cluster Mass Functions from the Large-scale X-ray Survey(Fostering Joint International Research)

Research Project

Project/Area Number 16KK0101
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionNara Women's University

Principal Investigator

Ota Naomi  奈良女子大学, 自然科学系, 准教授 (40391891)

Project Period (FY) 2017 – 2022
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Keywords銀河団 / 精密宇宙論 / X線天文学 / 質量関数 / ダークマター / ダークエネルギー / X線天文学
Outline of Final Research Achievements

The eROSITA X-ray telescope on board the SRG satellite, launched in 2019, has a wide field of view and high collecting power and is undergoing an extensive survey program to unravel the dark energy in the universe. First, analysis of X-ray images of the galaxy cluster Abell 3391/95 revealed a 5,000-light-year-long filament of gas connecting galaxies and clusters. We also systematically analyzed eROSITA data for massive clusters of galaxies found with the Subaru Telescope and measured their dynamical states and luminosity-mass relationships. The results show that while the properties of the optical clusters tend to differ from those of known X-ray clusters, they are consistent with recent theoretical models that consider the mass concentration of dark matter.

Academic Significance and Societal Importance of the Research Achievements

宇宙最大の天体である銀河団の形成進化は、宇宙そのものの進化と結びついている。まず、大規模なガスフィラメントの観測が実現したことで、標準的な理論モデルを指示する結果を得た。また、X線望遠鏡eROSITAとすばる望遠鏡を組み合わせることで、一様な銀河団サンプルを築き、可視光銀河団の力学状態や統計的な性質に制限をつけることができた。この方法をより多くのサンプルに適用することでダークマター質量推定を高精度化し、将来の宇宙論応用につなげることができる。また、オンラインでセミナーや講習会を開催し、将来計画を担う国内外の学生や若手研究者の交流を促した。

Report

(2 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (8 results)

All 2023 2022 2021 2019

All Int'l Joint Research (1 results) Journal Article (7 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 7 results,  Open Access: 6 results)

  • [Int'l Joint Research] Argelander-Institut fuer Astronomie, Rheinische Friedrich-Wilhelms-Universitaet Bonn(ドイツ)2019

    • Year and Date
      2019-01-07
    • Related Report
      2022 Annual Research Report
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS)2023

    • Author(s)
      Ota N.、Nguyen-Dang N. T.、Mitsuishi I.、Oguri M.、Klein M.、Okabe N.、Ramos-Ceja M. E.、Reiprich T. H.、Pacaud F.、Bulbul E.、Bruggen M.、Liu A.、Migkas K.、Chiu I.、Ghirardini V.、Grandis S.、Lin Y.-T.、Miyatake H.、Miyazaki S.、Sanders J. S.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 669 Pages: A110-A110

    • DOI

      10.1051/0004-6361/202244260

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] X-ray studies of the Abell 3158 galaxy cluster with eROSITA2022

    • Author(s)
      Whelan B.、Veronica A.、Pacaud F.、Reiprich T. H.、Bulbul E.、Ramos-Ceja M. E.、Sanders J. S.、Aschersleben J.、Iljenkarevic J.、Migkas K.、Freyberg M.、Dennerl K.、Kara M.、Liu A.、Ghirardini V.、Ota N.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 663 Pages: A171-A171

    • DOI

      10.1051/0004-6361/202141621

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The eROSITA view of the Abell 3391/95 field: Case study from the Magneticum cosmological simulation2022

    • Author(s)
      Biffi Veronica、Dolag Klaus、Reiprich Thomas H.、Veronica Angie、Ramos-Ceja Miriam E.、Bulbul Esra、Ota Naomi、Ghirardini Vittorio
    • Journal Title

      Astronomy & Astrophysics

      Volume: 661 Pages: A17-A17

    • DOI

      10.1051/0004-6361/202141107

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS). A complete census of X-ray properties of Subaru Hyper Suprime-Cam weak lensing shear-selected clusters in the eFEDS footprint2022

    • Author(s)
      Ramos-Ceja M. E.、Oguri M.、Miyazaki S.、Ghirardini V.、Chiu I.、Okabe N.、Liu A.、Schrabback T.、Akino D.、Bahar Y. E.、Bulbul E.、Clerc N.、Comparat J.、Grandis S.、Klein M.、Lin Y.-T.、Merloni A.、Mitsuishi I.、Miyatake H.、More S.、Nandra K.、Nishizawa A. J.、Ota N.、Pacaud F.、Reiprich T. H.、Sanders J. S.
    • Journal Title

      Astronomy & Astrophysics

      Volume: - Pages: A14-A14

    • DOI

      10.1051/0004-6361/202142214

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS)2022

    • Author(s)
      Ghirardini Vittorio、Emre Bahar Y.、Bulbul Esra、Liu Ang、Clerc Nicolas、Pacaud Florian、Comparat Johan、Liu Teng、Ramos-Ceja Miriam E.、Hoang Duy、Ider-Chitham Jacob、Klein Matthias、Merloni Andrea、Nandra Kirpal、Ota Naomi、Predehl Peter、Reiprich Thomas H.、Sanders Jeremy、Schrabback Tim
    • Journal Title

      Astronomy & Astrophysics

      Volume: 661 Pages: A12-A12

    • DOI

      10.1051/0004-6361/202141639

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS): Optical confirmation, redshifts, and properties of the cluster and group catalog2021

    • Author(s)
      Klein M.、Oguri M.、Mohr J. J.、Grandis S.、Ghirardini V.、Liu T.、Liu A.、Bulbul E.、Wolf J.、Comparat J.、Ramos-Ceja M. E.、Buchner J.、Chiu I.、Clerc N.、Merloni A.、Miyatake H.、Miyazaki S.、Okabe N.、Ota N.、Pacaud F.、Salvato M.、Driver S. P.
    • Journal Title

      Astronomy & Astrophysics

      Volume: - Pages: A4-A4

    • DOI

      10.1051/0004-6361/202141123

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS): The catalog of galaxy clusters and groups2021

    • Author(s)
      Liu A.、Bulbul E.、Ghirardini V.、Liu T.、Klein M.、Clerc N.、Oezsoy Y.、Ramos-Ceja M. E.、Pacaud F.、Comparat J.、Okabe N.、Bahar Y. E.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: - Pages: A2-A2

    • DOI

      10.1051/0004-6361/202141120

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research

URL: 

Published: 2017-03-15   Modified: 2025-01-30  

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