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Unraveling the Nature of Radio Jets Governing the Formation of Massive Galaxies

Research Project

Project/Area Number 21K13968
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Yamashita Takuji  国立天文台, ハワイ観測所, 特任研究員 (20800759)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords銀河 / 活動銀河核 / ブラックホール / 電波 / 赤外線 / 大規模データ / 光赤外線 / 銀河天文学 / 超巨大ブラックホール / 電波銀河 / すばる望遠鏡
Outline of Research at the Start

大質量銀河は宇宙初期から既に形成していたことが近年示されているが、そのような早期の質量成長は現在に至るまでに速やかに停止される必要があり、その機構は謎である。有力な候補機構として、電波銀河が持つ超巨大ブラックホールに駆動された電波ジェットがある。しかし、宇宙初期の電波銀河の探査は著しく停滞しているため理解が進んでいない。本研究は、最新の高感度かつ広域の可視光探査「すばる望遠鏡Hyper Suprime-Camサーベイ」大規模データと広域電波探査データを用いて、初期宇宙における電波銀河の探査を開拓し、宇宙初期の大質量銀河と電波ジェットの相互作用を評価し、大質量銀河の形成史を探る。

Outline of Final Research Achievements

The nature of massive galaxies suggests that they were already formed in the early universe, and radio-jets emitted by radio galaxies are strong candidates for the mechanism that halts their further mass growth. However, exploration of radio galaxies in the distant universe has been limited so far, and the understanding of the relationship between the formation of massive galaxies in the early universe and radio-jets has been inadequate. This research aims to pioneer the exploration of radio galaxies in the early universe using data from the Subaru Hyper Suprime-Cam survey and wide-field radio surveys, in order to elucidate the relationship between the formation of massive galaxies in the early universe and radio jets. In this project, we constructed, for the first time, a sample of distant radio galaxies with a redshift of 4 or higher and conducted follow-up spectroscopic observations, revealing the large-scale structures associated with these distant radio galaxies.

Academic Significance and Societal Importance of the Research Achievements

現在の宇宙に存在する全星質量の多くを占める大質量銀河の形成と進化を解き明かすことは天文学の一大課題である。本研究では、最新のすばる望遠鏡Hyper Suprime-Camサーベイデータと電波サーベイデータを活用することで、高赤方偏移での電波銀河サンプル構築方法を確立した。本研究が先駆けとなり、本手法による遠方電波銀河探査と関連する研究が国内外で始動し、停滞していた遠方電波銀河探査を打開することができた。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (21 results)

All 2023 2022 2021 Other

All Int'l Joint Research (5 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Int'l Joint Research] NSF's NOIRLab(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Bath(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Bath/University College London(英国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] NSF's NOIRLab(米国)

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

    • Related Report
      2021 Research-status Report
  • [Journal Article] Detection of Extended Millimeter Emission in the Host Galaxy of 3C 273 and Its Implications for QSO Feedback via High Dynamic Range ALMA Imaging2022

    • Author(s)
      Shinya Komugi, Yoshiki Toba, Yoshiki Matsuoka, Toshiki Saito, Takuji Yamashita
    • Journal Title

      Astrophysical Journal

      Volume: 930 Issue: 1 Pages: 1-7

    • DOI

      10.3847/1538-4357/ac616e

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VII. Redshift Evolution of Radio Galaxy Environments at z = 0.3?1.42022

    • Author(s)
      Uchiyama Hisakazu、Yamashita Takuji、Nagao Tohru、Ichikawa Kohei、Toba Yoshiki、Ishikawa Shogo、Kubo Mariko、Kajisawa Masaru、Kawaguchi Toshihiro、Kawakatu Nozomu、Lee Chien-Hsiu、Noboriguchi Akatoki
    • Journal Title

      The Astrophysical Journal

      Volume: 934 Issue: 1 Pages: 68-68

    • DOI

      10.3847/1538-4357/ac77ee

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The most overdense region at <i>z</i> ? 5 inhabited by a massive radio galaxy2022

    • Author(s)
      Uchiyama Hisakazu、Yamashita Takuji、Nagao Tohru、Ono Yoshiaki、Toshikawa Jun、Ichikawa Kohei、Kawakatu Nozomu、Kajisawa Masaru、Toba Yoshiki、Matsuoka Yoshiki、Kubo Mariko、Imanishi Masatoshi、Ito Kei、Kawaguchi Toshihiro、Lee Chien-Hsiu、Saito Tomoki
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 74 Issue: 6 Pages: 27-32

    • DOI

      10.1093/pasj/psac075

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed Out by High-z Radio Galaxies at z ? 42022

    • Author(s)
      Uchiyama Hisakazu、Yamashita Takuji、Toshikawa Jun、Kashikawa Nobunari、Ichikawa Kohei、Kubo Mariko、Ito Kei、Kawakatu Nozomu、Nagao Tohru、Toba Yoshiki、Ono Yoshiaki、Harikane Yuichi、Imanishi Masatoshi、Kajisawa Masaru、Lee Chien-Hsiu、Liang Yongming
    • Journal Title

      The Astrophysical Journal

      Volume: 926 Issue: 1 Pages: 76-76

    • DOI

      10.3847/1538-4357/ac441c

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS): Co-evolution of Radio Galaxies and the Surrounding Galaxies at Various Cosmic Epochs2023

    • Author(s)
      Hisakazu Uchiyama, Takuji Yamashita, et al.
    • Organizer
      Tracing the SMBH growth: outlook beyond the HSC-SSP, and future collaborations
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Nature of New z~4 High-z Radio Galaxies from HSC-SSP and VLA/FIRST2023

    • Author(s)
      Yuta Yamamoto, Tohru Nagao, Hisakazu Uchiyama, Takuji Yamashita, Yoshiki Toba, Mariko Kubo, Akatoki Noboriguchi, Yoshiaki Ono, Yuichi Harikane, and the WERGS team
    • Organizer
      Subaru Users Meeting FY2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] 高赤方偏移電波銀河の分光追観測2022

    • Author(s)
      山下拓時, WERGS コラボレーション
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS): z = 4.72 の電波銀河周辺環境2022

    • Author(s)
      内山久和, 山下拓時, 長尾透, 鍛冶澤賢, 松岡良樹, 久保真理子, 小野宜昭, 利川潤, 市川幸平, 川勝望, 鳥羽儀樹, 今西昌俊, 伊藤慧, 川口俊宏, Chien-Hsiu Lee, 斎藤智樹
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 赤方偏移 4 における遠方電波銀河の探査と性質調査2022

    • Author(s)
      山本優太, 長尾透, 久保真理子, 内山久和, 山下拓時, 鳥羽儀樹, 登口暁, 播金優一, 小野宜昭
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] WERGS project status and follow-up observations2022

    • Author(s)
      Takuji Yamashita, Wanqiu He, Kohei Ichikawa, Bovornpratch Vijarnwannaluk, Hisakazu Uchiyama, Tohru Nagao, Yuta Yamamoto, and WERGS collaboration
    • Organizer
      Tracing the SMBH growth: outlook beyond the HSC-SSP, and future collaborations
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A new z~4 radio galaxy survey with HSC-SSP and VLA/FIRST2022

    • Author(s)
      Yuta Yamamoto, Tohru Nagao, Kubo Mariko, Hisakazu Uchiyama, Takuji Yamashita, Yoshiki Toba, Akatoki Noboriguchi, Yuichi Harikane, Yoshiaki Ono
    • Organizer
      Tracing the SMBH growth: outlook beyond the HSC-SSP, and future collaborations
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radio galaxy catalog in the Subaru/HSC Joint catalog field2022

    • Author(s)
      Kohei Ichikawa, Itsna Khoirul Fitriana, Takuji Yamashita, Hikaru Fukuchi, Masayuki Akiyama, Yu-Yen Chang, Andrew Battisti, Elisabete da Cunha, WERGS team, HSC-Joint catalog team
    • Organizer
      Tracing the SMBH growth: outlook beyond the HSC-SSP, and future collaborations
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GREX-PLUSによる電波銀河観測2022

    • Author(s)
      山下拓時
    • Organizer
      GREX-PLUS サイエンス検討会 FY2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS): z = 0.3 - 1.4 の電波銀河周辺環境の統計的理解2022

    • Author(s)
      内山 久和 (愛媛大), 山下 拓時 (国立天文台), 長尾 透, 久保 真理子, 鍛冶澤 賢 (愛媛大), 市川 幸平, 登口 暁 (東北大), 鳥羽 儀樹 (京都大), 石川 将吾 (国立天文台), 川口 俊宏 (尾道大), 川勝 望 (呉高 専), Chien-Hsiu Lee (NOIRLab), and WERGS members
    • Organizer
      日本天文学会2022年春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Radio galaxies in the early universe found in Subaru HSC-SSP2021

    • Author(s)
      Takuji Yamashita
    • Organizer
      ALMA-J Seminar
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS): z ~ 4 の暗い電波銀河周辺環境の統計的理解2021

    • Author(s)
      内山 久和 (愛媛大), 山下 拓時 (国立天文台), 利川 潤 (Bath univ.), 柏川 伸成 (東京大), 市川 幸平 (東北大), 久保 真理子, 長尾 透, 鍛冶澤 賢 (愛媛大), 鳥羽 儀樹 (京都大), 伊藤 慧, Yongming Liang (総研大), 川勝 望 (呉高専), 小野 宜昭, 播金 優一 (宇宙線研), 今西 昌俊 (国立天文台), Chien-Hsiu Lee (NOIRLab)
    • Organizer
      日本天文学会2021年秋季年会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2024-01-30  

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