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Spatially Resolving Submillimeter galaxies with ALMA

Research Project

Project/Area Number 20K14526
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionHokkai-Gakuen University (2023)
National Astronomical Observatory of Japan (2020-2022)

Principal Investigator

Tadaki Ken-ichi  北海学園大学, 工学部, 准教授 (30726435)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords銀河天文学 / 電波天文学 / 銀河進化
Outline of Research at the Start

楕円銀河の形成過程の解明は現代銀河天文学における究極的な目標の1つである。現在の我々の理解は、『およそ100億年前にあるコンパクトな大質量銀河がガスの枯渇した小質量銀河との衝突合体を経て、巨大な楕円銀河へと進化した』というところまでであり、さらに遡った歴史についてはほとんどわかっていない。本研究では、コンパクトな大質量銀河の直近の祖先だと考えられるサブミリ波銀河に着目し、世界最高性能のアルマ望遠鏡を用いて分子輝線の観測を行い、ガスの運動学的・物理的性質を明らかにする。

Outline of Final Research Achievements

In this research project, we used the ALMA telescope to observe galaxies that could be precursors of elliptical galaxies in the distant Universe, in order to unravel how massive galaxies evolve into elliptical galaxies. The targets are broadly divided into two galaxy populations: multiple massive galaxies at z=2 and a single massive galaxy at z=6. We have observed the formation process of a bulge in the central regions of elliptical galaxy ancestors from different epochs. We also successfully measured the abundance of heavy elements in galaxies in preparation for the launch of the James Webb Space Telescope.

Despite challenges such as the interruption of ALMA telescope operations due to COVID-19, I managed to publish three peer-reviewed papers as lead author during the research period.

Academic Significance and Societal Importance of the Research Achievements

筆頭著者として発表した3本の論文のうちの1つについては、アルマ望遠鏡のホームページでプレスリリースを行った。現在私たちの身の回りに当たり前のように存在している窒素や酸素といった元素は宇宙誕生時には存在しておらず、宇宙の歴史と共にこれらの重元素が増えてきたことを多くに人に知ってもらうことができた。

Report

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

    (19 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (5 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: 1 results,  Invited: 5 results) Remarks (2 results)

  • [Int'l Joint Research] Danmarks Tekniske Universitet(DTU)/DAWN(デンマーク)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] The University of Texas at Austin/Texas A&M University(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] INAOE(メキシコ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] MPE(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] CfA/Yale University(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Spatial Extent of Molecular Gas, Dust, and Stars in Massive Galaxies at z~2.2-2.5 Determined with ALMA and JWST2023

    • Author(s)
      Tadaki Ken-ichi、Kodama Tadayuki、Koyama Yusei、Suzuki Tomoko L.、Mitsuhashi Ikki、Ikeda Ryota
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 957 Issue: 2 Pages: L15-L15

    • DOI

      10.3847/2041-8213/ad03f2

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Central concentration of warm and dense molecular gas in a strongly lensed submillimeter galaxy at z = 62022

    • Author(s)
      Tsujita Akiyoshi、Tadaki Ken-ichi、Kohno Kotaro、Hatsukade Bunyo、Egusa Fumi、Tamura Yoichi、Nishimura Yuri、Zavala Jorge、Saito Toshiki、Umehata Hideki、Lee Minju M
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 74 Issue: 6 Pages: 1429-1440

    • DOI

      10.1093/pasj/psac082

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Probing Cold Gas in a Massive, Compact Star-forming Galaxy at z = 62022

    • Author(s)
      Zavala Jorge A.、Casey Caitlin M.、Spilker Justin、Tadaki Ken-ichi、Tsujita Akiyoshi、Champagne Jaclyn、Iono Daisuke、Kohno Kotaro、Manning Sinclaire、Montana Alfredo
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 2 Pages: 242-242

    • DOI

      10.3847/1538-4357/ac7560

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Detection of nitrogen and oxygen in a galaxy at the end of reionization2022

    • Author(s)
      Ken-ichi Tadaki, Akiyoshi Tsujita, Yoichi Tamura, Kotaro Kohno, Bunyo Hatsukade, Daisuke Iono, Minju Lee, Yuichi Matsuda, Tomonari Michiyama, Tohru Nagao, Kouichiro Nakanishi, Yuri Nishimura, Toshiki Saito, Hideki Umehata, Jorge Zavala
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Structural Evolution in Massive Galaxies at z ~ 22020

    • Author(s)
      Tadaki Ken-ichi、Belli Sirio、Burkert Andreas、Dekel Avishai、Forster Schreiber Natascha M.、Genzel Reinhard、Hayashi Masao、Herrera-Camus Rodrigo、Kodama Tadayuki、Kohno Kotaro、Koyama Yusei、Lee Minju M.、Lutz Dieter、Mowla Lamiya、Nelson Erica J.、(他5名)
    • Journal Title

      The Astrophysical Journal

      Volume: 901 Issue: 1 Pages: 74-74

    • DOI

      10.3847/1538-4357/abaf4a

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ALMA observations of a submillimeter galaxy at z = 6 I: Detection of nitrogen2022

    • Author(s)
      Ken-ichi Tadaki, Akiyoshi Tsujita, Yoichi Tamura, Kotaro Kohno, Yuri Nishimura, Bunyo Hatsukade, Hideki Umehata, Daisuke Iono, Jorge Zavala, Kouichiro Nakanishi, Yuichi Matsuda, Minju Lee, Tomonari Michiyama, Tohru Nagao, Toshiki Saito
    • Organizer
      日本天文学会2022年春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Formation and evolution of massive galaxies2022

    • Author(s)
      Kenichi Tadaki
    • Organizer
      East Asia ALMA Science Workshop 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Redshifted CO line emission with ngVLA and SKA2021

    • Author(s)
      Kenichi Tadaki
    • Organizer
      Linking the Science of Large Interferometer in the 2030s
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 広視野サブミリ波探査で解き明かす巨大銀河の形成2021

    • Author(s)
      但木謙一
    • Organizer
      日本天文学会2021年秋季年会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] ALMA science IV: ALMA+Subaru observations of high-redshift cluster galaxies2021

    • Author(s)
      Kenichi Tadaki
    • Organizer
      ALMA/45m/ASTE Users Meeting 2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] サブミリ波銀河の中心に超巨大ブラックホールはあるのか?2021

    • Author(s)
      但木謙一
    • Organizer
      超巨大ブラックホール研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] アルマとハッブル宇宙望遠鏡の協調観測で探る銀河の形態進化2021

    • Author(s)
      但木謙一
    • Organizer
      天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Remarks] アルマ望遠鏡とジェームズ・ウェッブ宇宙望遠鏡で観測した約110億年前の銀河

    • URL

      https://eng.hgu.jp/archives/5650.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] アルマ望遠鏡、 129億年前の銀河から窒素と酸素の電波をとらえる

    • URL

      https://alma-telescope.jp/news/nitrogenandoxygen_202202

    • Related Report
      2021 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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