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Rapid supermassive black hole growth revealed by multi-wavelength surveys

Research Project

Project/Area Number 20H01939
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionWaseda University (2022-2023)
Tohoku University (2020-2021)

Principal Investigator

Ichikawa Kohei  早稲田大学, 理工学術院, 准教授(任期付) (40756293)

Co-Investigator(Kenkyū-buntansha) 山下 拓時  国立天文台, ハワイ観測所, 特任研究員 (20800759)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords超巨大ブラックホール / 活動銀河核 / X線 / 赤外線 / eROSITA / すばる望遠鏡 / ブラックホール / 可視光線 / 電波 / 可視光 / 電波銀河 / 多波長観測
Outline of Research at the Start

膨大な質量を持つ超巨大ブラックホールと恒星質量BHとの5桁におよぶ大きな質量ギャップは未だ埋まっておらず、その質量獲得の起源大きな謎のままである。本研究では、100平方度以上の幅広い領域を探査したすばる望遠鏡/HSCサーベイとVLA/FIRST電波サーベイのデータを掛け合わせることで見つかったmassive BH候補天体に対して、多波長フォローアップ観測を国際協力のもと実施する。そして、mBH 天体を倍増させ、その激しい成長率とその母銀河に与える影響までを調査し、謎に包まれていた mBH からSMBHへの成長変遷期を明らかにすることを目指す。

Outline of Final Research Achievements

This goal of this project is to explore and understand the properties of previously missing obscured active galactic nuclei and massive black hole candidate objects by combining the large area multi-wavelength surveys, such as Subaru HSC SSP survey, VLASS radio survey, eROSITA X-ray survey, and WISE infrared survey.
We succeed constructing the samples with key properties for the growth of supermassive black holes, such as understanding the gas distribution around buried active galactic nuclei through the first statistical X-ray sample of DOGs, discovering radio sources those are extremely faint in the optical, and constructing a sample of buried active galactic nuclei that are bright in both radio and X-ray in high redshift Universe.

Academic Significance and Societal Importance of the Research Achievements

本研究を通して、現在利用可能な広域多波長データには多くの見過ごされてきた活動銀河核種族が存在することがわかった。本多波長データのレガシーバリューは非常に高く、今後も本サンプルを通じて超巨大ブラックホール成長の理解に迫ることができる。また、今後サーベイがスタートするEuclid赤外線衛星やLSST可視光望遠鏡との親和性も高く、本研究のノウハウを活かすことで将来的にもサンプル構築を進めることができる。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (58 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (10 results) Journal Article (35 results) (of which Int'l Joint Research: 34 results,  Peer Reviewed: 35 results,  Open Access: 27 results) Presentation (12 results) (of which Int'l Joint Research: 10 results,  Invited: 3 results) Remarks (1 results)

  • [Int'l Joint Research] University of Texas at San Antonio/STScI(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Diego Portales(チリ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Peking University/KIAA(中国)

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

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] KIAA(中国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Stanford University/NOIRlab/University of Texas at San Antonio(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Diego Portales(チリ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] KASI(韓国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] MPE(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] MPE(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Black Hole Mass and Eddington-ratio Distributions of Less-luminous Quasars at z ? 4 in the Subaru Hyper Suprime-Cam Wide Field2024

    • Author(s)
      He Wanqiu、Akiyama Masayuki、Enoki Motohiro、Ichikawa Kohei、Inayoshi Kohei、Kashikawa Nobunari、Kawaguchi Toshihiro、Matsuoka Yoshiki、Nagao Tohru、Onoue Masafusa、Oogi Taira、Schulze Andreas、Toba Yoshiki、Ueda Yoshihiro
    • Journal Title

      The Astrophysical Journal

      Volume: 962 Issue: 2 Pages: 152-152

    • DOI

      10.3847/1538-4357/ad1518

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 57282024

    • Author(s)
      Leist M. T.、Packham C.、Rosario D. J. V.、Hope D. A.、Alonso-Herrero A.、Hicks E. K. S.、Honig S.、Zhang L.、Davies R.、Diaz-Santos T.、Gonzalez-Martin O.、Bellocchi E.、Boorman P. G.、Combes F.、Garcia-Bernete I.、Garcia-Burillo S.、Garcia-Lorenzo B.、Haidar H.、Ichikawa K.、Imanishi M.、et al.
    • Journal Title

      The Astronomical Journal

      Volume: 167 Issue: 3 Pages: 96-96

    • DOI

      10.3847/1538-3881/ad1886

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Massive Molecular Gas Companions Uncovered by Very Large Array CO(1-0) Observations of the z = 5.2 Radio Galaxy TN J0924-22012023

    • Author(s)
      Lee Kianhong、Kohno Kotaro、Hatsukade Bunyo、Egusa Fumi、Yamashita Takuji、Schramm Malte、Ichikawa Kohei、Imanishi Masatoshi、Izumi Takuma、Nagao Tohru、Toba Yoshiki、Umehata Hideki
    • Journal Title

      The Astrophysical Journal

      Volume: 944 Issue: 1 Pages: 35-35

    • DOI

      10.3847/1538-4357/acaf58

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] eROSITA Final Equatorial-Depth Survey (eFEDS). eFEDS X-ray view of WERGS radio galaxies selected by the Subaru/HSC and VLA/FIRST survey2023

    • Author(s)
      Ichikawa Kohei、Yamashita Takuji、Merloni Andrea、Li Junyao、Liu Teng、Salvato Mara、Akiyama Masayuki、Arcodia Riccardo、Dwelly Tom、Chen Xiaoyang、Imanishi Masatoshi、Inayoshi Kohei、Kawaguchi Toshihiro、Kawamuro Taiki、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 672 Pages: A171-A171

    • DOI

      10.1051/0004-6361/202244271

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BASS. XXXV. The M BH-σ Relation of 105 Month Swift-BAT Type 1 AGNs2023

    • Author(s)
      Caglar Turgay、Koss Michael J.、Burtscher Leonard (incl. Ichikawa Kohei) et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 956 Issue: 1 Pages: 60-60

    • DOI

      10.3847/1538-4357/acf11b

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXXIV. A Catalog of the Nuclear Millimeter-wave Continuum Emission Properties of AGNs Constrained on Scales <~ 100--200 pc2023

    • Author(s)
      Kawamuro Taiki、Ricci Claudio、Mushotzky Richard F.、et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 269 Issue: 1 Pages: 24-24

    • DOI

      10.3847/1538-4365/acf467

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BASS. XLII. The Relation between the Covering Factor of Dusty Gas and the Eddington Ratio in Nearby Active Galactic Nuclei2023

    • Author(s)
      Ricci C.、Ichikawa K.、Stalevski M.、Kawamuro T.、Yamada S.、Ueda Y.、Mushotzky R.、Privon G. C.、Koss M. J.、Trakhtenbrot B.、Fabian A. C.、Ho L. C.、Asmus D.、Bauer F. E.、Chang C. S.、Gupta K. K.、Oh K.、Powell M.、Pfeifle R. W.、Rojas A.、Ricci F.、Temple M. J.、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 959 Issue: 1 Pages: 27-36

    • DOI

      10.3847/1538-4357/ad0733

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA final equatorial-depth survey (eFEDS): host-galaxy demographics of X-ray AGNs with Subaru Hyper Suprime-Cam2023

    • Author(s)
      Li Junyao、Silverman John D、Merloni Andrea、Salvato Mara、Buchner Johannes、Goulding Andy、Liu Teng、Arcodia Riccardo、Comparat Johan、Ding Xuheng、Ichikawa Kohei、Imanishi Masatoshi、Kawaguchi Toshihiro、Kawinwanichakij Lalitwadee、Toba Yoshiki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 527 Issue: 3 Pages: 4690-4704

    • DOI

      10.1093/mnras/stad3438

    • 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 2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BASS. XXI. The Data Release 2 Overview2022

    • Author(s)
      Koss M. J., Trakhtenbrot B., Ricci C., Bauer F. E., Treister E., Mushotzky R., Urry C. M., Ananna Tonima T., Balokovic M., den Brok Jakob S., Cenko S. B., Harrison F., Ichikawa K., et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 1-1

    • DOI

      10.3847/1538-4365/ac6c8f

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXII. The BASS DR2 AGN Catalog and Data2022

    • Author(s)
      Koss M. J., Ricci C., Trakhtenbrot B., Oh K., den Brok Jakob S., (incl. Ichikawa K.), et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 2-2

    • DOI

      10.3847/1538-4365/ac6c05

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXIII. A New Mid-infrared Diagnostic for Absorption in Active Galactic Nuclei2022

    • Author(s)
      Pfeifle Ryan W.、Ricci Claudio、Boorman Peter G.、Stalevski Marko、Asmus Daniel、Trakhtenbrot Benny、Koss Michael J.、Stern Daniel、Ricci Federica、Satyapal Shobita、Ichikawa Kohei、Rosario David J.、Caglar Turgay、Treister Ezequiel、Powell Meredith、Oh Kyuseok、Urry C. Megan、Harrison Fiona
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 3-3

    • DOI

      10.3847/1538-4365/ac5b65

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXIV. The BASS DR2 Spectroscopic Line Measurements and AGN Demographics2022

    • Author(s)
      Oh Kyuseok、Koss Michael J.、Ueda Yoshihiro (incl. Ichikawa Kohei) et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 4-4

    • DOI

      10.3847/1538-4365/ac5b68

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration2022

    • Author(s)
      Mejia-Restrepo Julian E.、Trakhtenbrot Benny、Koss Michael J. (incl. Ichikawa Kohei) et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 5-5

    • DOI

      10.3847/1538-4365/ac6602

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXVIII. Near-infrared Data Release 2: High-ionization and Broad Lines in Active Galactic Nuclei*2022

    • Author(s)
      den Brok Jakob S.、Koss Michael J.、Trakhtenbrot Benny (incl. Ichikawa Kohei) et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 7-7

    • DOI

      10.3847/1538-4365/ac5b66

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXIX. The Near-infrared View of the Broad-line Region (BLR): The Effects of Obscuration in BLR Characterization*2022

    • Author(s)
      Ricci Federica、Treister Ezequiel、Bauer Franz E. (incl. Ichikawa Kohei) et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 8-8

    • DOI

      10.3847/1538-4365/ac5b67

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] BASS. XXX. Distribution Functions of DR2 Eddington Ratios, Black Hole Masses, and X-Ray Luminosities2022

    • Author(s)
      Ananna Tonima Tasnim et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 261 Issue: 1 Pages: 9-9

    • DOI

      10.3847/1538-4365/ac5b64

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mid-Infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.092022

    • Author(s)
      M. Uchiyama, K. Ichikawa, K. Sugiyama, Y. Tanabe and Y. Yonekura
    • Journal Title

      Astrophys. J.

      Volume: 936 Issue: 1 Pages: 31-31

    • DOI

      10.3847/1538-4357/ac866e

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Finding of a Population of Active Galactic Nuclei Showing a Significant Luminosity Decline in the Past ~10^3-10^4 yr2022

    • Author(s)
      Pflugradt Janek、Ichikawa Kohei、Akiyama Masayuki、Kokubo Mitsuru、Vijarnwannaluk Bovornpractch、Noda Hirofumi、Chen Xiaoyang
    • Journal Title

      The Astrophysical Journal

      Volume: 938 Issue: 1 Pages: 75-75

    • DOI

      10.3847/1538-4357/ac8ff3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BASS XXXII: Studying the Nuclear Millimeter-wave Continuum Emission of AGNs with ALMA at Scales <100-200 pc2022

    • Author(s)
      Kawamuro Taiki、Ricci Claudio、Imanishi Masatoshi、Mushotzky Richard F.、Izumi Takuma、Ricci Federica、Bauer Franz E.、Koss Michael J.、Trakhtenbrot Benny、Ichikawa Kohei、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 938 Issue: 1 Pages: 87-87

    • DOI

      10.3847/1538-4357/ac8794

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] H1821+643: The Most X-Ray and Infrared Luminous Active Galactic Nucleus (AGN) in the Swift/BAT Survey in the Process of Rapid Stellar and Supermassive Black Hole Mass Assembly2022

    • Author(s)
      Fukuchi Hikaru、Ichikawa Kohei、Akiyama Masayuki、Ricci Claudio、Chon Sunmyon、Kokubo Mitsuru、Liu Ang、Hashimoto Takuya、Izumi Takuma
    • Journal Title

      The Astrophysical Journal

      Volume: 940 Issue: 1 Pages: 7-7

    • DOI

      10.3847/1538-4357/ac9304

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy2022

    • Author(s)
      Noboriguchi Akatoki, Nagao Tohru, Toba Yoshiki, Ichikawa Kohei, Kajisawa Masaru, Kato Nanako, Kawaguchi Toshihiro, Matsuhara Hideo, Matsuoka Yoshiki, Onishi Kyoko, Onoue Masafusa, Tamada Nozomu, Terao Koki, Terashima Yuichi, Ueda Yoshihiro, Yamashita Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 941 Issue: 2 Pages: 195-195

    • DOI

      10.3847/1538-4357/aca403

    • Related Report
      2022 Annual Research Report 2020 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 2020 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 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS). Identification and characterization of the counterparts to point-like sources2022

    • Author(s)
      Salvato M., Wolf J., Dwelly T., Georgakakis A., Brusa M., Merloni A., Liu T., Toba Y., Nandra K., Lamer G., Buchner J., Schneider C., Freund S., Rau A., Schwope A., Nishizawa A., Klein M., Arcodia R., Comparat J., Musiimenta B., Nagao T., et al.
    • Journal Title

      Astronomy and Astrophysics

      Volume: 661 Pages: A3-A3

    • DOI

      10.1051/0004-6361/202141631

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS)2022

    • Author(s)
      Liu Teng et al. (including Ichikawa, K.)
    • Journal Title

      Astronomy & Astrophysics

      Volume: 661 Pages: A5-A5

    • DOI

      10.1051/0004-6361/202141643

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS). A multiwavelength view of WISE mid-infrared galaxies/active galactic nuclei2022

    • Author(s)
      Toba Yoshiki、Liu Teng、Urrutia Tanya、Salvato Mara、Li Junyao、Ueda Yoshihiro、Brusa Marcella、Yutani Naomichi、Wada Keiichi、Nishizawa Atsushi J.、Buchner Johannes、Nagao Tohru、Merloni Andrea、Akiyama Masayuki、Arcodia Riccardo、Hsieh Bau-Ching、Ichikawa Kohei、Imanishi Masatoshi、Inoue, Kaiki T.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 661 Pages: A15-A15

    • DOI

      10.1051/0004-6361/202141547

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] BAT AGN Spectroscopic Survey XXVII: scattered X-Ray radiation in obscured active galactic nuclei2021

    • Author(s)
      Gupta K K、Ricci C、Tortosa A、Ueda Y、Kawamuro T、Koss M、Trakhtenbrot B、Oh K、Bauer F E、Ricci F、Privon G C、Zappacosta L、Stern D、Kakkad D、Piconcelli E、Veilleux S、Mushotzky R、Caglar T、Ichikawa K、Elagali A、Powell M C、Urry C M、Harrison F
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 504 Issue: 1 Pages: 428-443

    • DOI

      10.1093/mnras/stab839

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Galaxy Activity, Torus, and Outflow Survey (GATOS)2021

    • Author(s)
      Garcia-Burillo S.、Alonso-Herrero A.、Ramos Almeida C.、Gonzalez-Martin O.、Combes F.、Usero A.、Hoenig S.、Querejeta M.、Hicks E. K. S.、Hunt L. K.、Rosario D.、Davies R.、Boorman P. G.、Bunker A. J.、Burtscher L.、Colina L.、Diaz-Santos T.、Gandhi P.、Garcia-Bernete I.、Garcia-Lorenzo B.、Ichikawa K. et al.
    • Journal Title

      Astronomy &amp; Astrophysics

      Volume: 652 Pages: A98-A98

    • DOI

      10.1051/0004-6361/202141075

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Galaxy Activity, Torus, and Outflow Survey (GATOS)2021

    • Author(s)
      Alonso-Herrero A.、Garcia-Burillo S.、Hoenig S. F.、Garcia-Bernete I.、Ramos Almeida C.、Gonzalez-Martin O.、Lopez-Rodriguez E.、Boorman P. G.、Bunker A. J.、Burtscher L.、Combes F.、Davies R.、Diaz-Santos T.、Gandhi P.、Garcia-Lorenzo B.、Hicks E. K. S.、Hunt L. K.、Ichikawa K. et al.
    • Journal Title

      Astronomy &amp; Astrophysics

      Volume: 652 Pages: A99-A99

    • DOI

      10.1051/0004-6361/202141219

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Three case reports on the cometary plasma tail in the historical documents2021

    • Author(s)
      Hisashi Hayakawa, Yuri I. Fujii, Koji Murata et al.
    • Journal Title

      Journal of Space Weather and Space Climate

      Volume: 11 Pages: 21-21

    • DOI

      10.1051/swsc/2020045

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hypercubes of AGN Tori (HYPERCAT). I. Models and Image Morphology2021

    • Author(s)
      Nikutta Robert、Lopez-Rodriguez Enrique、Ichikawa Kohei、Levenson N. A.、Packham Christopher、Hoenig Sebastian F.、Alonso-Herrero Almudena
    • Journal Title

      The Astrophysical Journal

      Volume: 919 Issue: 2 Pages: 136-136

    • DOI

      10.3847/1538-4357/ac06a6

    • Related Report
      2021 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). IV. Rapidly Growing (Super)Massive Black Holes in Extremely Radio-loud Galaxies2021

    • Author(s)
      Ichikawa Kohei、Yamashita Takuji、Toba Yoshiki、Nagao Tohru、Inayoshi Kohei、Charisi Maria、He Wanqiu、Wagner Alexander Y. et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 921 Issue: 1 Pages: 51-51

    • DOI

      10.3847/1538-4357/ac1b26

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program2021

    • Author(s)
      Tang S.、Silverman J.D.、Ding X.、Li J.、Lee K.-G.、Strauss M.A.、Goulding A.、Schramm M.、Kawinwanichakij L.、Xavier P.J.、Hennawi J.F.、Imanishi M.、Iwasawa K.、Toba Y.、Kayo I.、Oguri M.、Matsuoka Y.、Onoue M.、Jahnke K.、Ichikawa K.、Hartwig T.、Kashikawa N.、Kawaguchi Toshihiro、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 922 Issue: 1 Pages: 83-83

    • DOI

      10.3847/1538-4357/ac1ff0

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Hypercubes of AGN Tori (HYPERCAT). II. Resolving the Torus with Extremely Large Telescopes2021

    • Author(s)
      Nikutta Robert、Lopez-Rodriguez Enrique、Ichikawa Kohei、Levenson N. A.、Packham Christopher、Hoenig Sebastian F.、Alonso-Herrero Almudena
    • Journal Title

      The Astrophysical Journal

      Volume: 923 Issue: 1 Pages: 127-127

    • DOI

      10.3847/1538-4357/ac2949

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Quasar/AGN search at z = 3~9 revealed by Euclid+UNIONS survey2023

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Subaru in the era of Euclid, NAOJ, Japan
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ngVLA as first (radio) quasar excavator?2023

    • Author(s)
      Kohei Ichikawa
    • Organizer
      ngVLA SWG3+5 workshop, NAOJ
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] NuSTAR discovery of a dead quasar engine in Arp 1872022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Ten Years of High-Energy Universe in Focus: NuSTAR 2022, Sardina, Italy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Signature of Cosmic Black Holes, Athen, Greece (hybrid)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Resolving the Rise and Fall of Star Formation in Galaxies, Busan, South Korea (hybrid)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Physics of relativistic jets on all scales, Busan, South Korea (hybrid)
    • 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
    • Organizer
      Tracing the SMBH growth: outlook beyond the HSC-SSP, and future collaborations, Kagoshima U., Japan (hybrid, zoom)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Recent observational progress on AGN and SMBH science2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Galaxy-IGM workshop 2022, 釧路
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] eFEDS X-ray view of WERGS: Radio Galaxies selected by the Subaru/HSC and VLA/FIRST survey2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      eROSITA Consortium Meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022

    • Author(s)
      Kohei Ichikawa
    • Organizer
      COSPAR general assembly
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Serendipitous Discovery of Dying AGN in Arp 1872021

    • Author(s)
      Kohei Ichikawa
    • Organizer
      238th American Astronomical Society meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapid SMBH growth in the extremely radio-loud galaxies2021

    • Author(s)
      Kohei Ichikawa
    • Organizer
      European Astronomical Society meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Discovery of a Dying Supermassive Black Hole

    • URL

      https://www.tohoku.ac.jp/en/press/discovery_of_dying_supermassive_black_hole.html

    • Related Report
      2021 Annual Research Report

URL: 

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

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