Ichikawa Kohei 市川幸平

… Alternative Names

市川幸平イチカワコウヘイ

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Researcher Number	40756293
Other IDs
Affiliation (Current)	2025: 早稲田大学, 理工学術院, 准教授(任期付)
Affiliation (based on the past Project Information) *help	2025: 早稲田大学, 理工学術院, 准教授(任期付) 2022 – 2023: 早稲田大学, 理工学術院, 准教授(任期付) 2018 – 2021: 東北大学, 学際科学フロンティア研究所, 助教 2016: 国立天文台, ハワイ観測所, 特任研究員 2015: 国立天文台, ハワイ観測所, 特別客員研究員
Review Section/Research Field	Principal Investigator Basic Section 16010:Astronomy-related / Astronomy
Keywords	Principal Investigator 活動銀河核 / 超巨大ブラックホール / 赤外線 / ブラックホール / X線 / 可視光観測 / 電波観測 / 多波長観測 / 電波銀河 / 可視光 … More / 電波 / 可視光線 / すばる望遠鏡 / eROSITA / 月 / 干渉効果 / 食 / 太陽系外縁天体 / 時間分解能 / エックス線 / AGN Less

Revealing the origins of optically dark radio AGNPrincipal Investigator
- Principal Investigator
  
  市川幸平
- Project Period (FY)
  2025 – 2028
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 16010:Astronomy-related
- Research Institution
  Waseda University
Rapid supermassive black hole growth revealed by multi-wavelength surveysPrincipal Investigator
- Principal Investigator
  
  Ichikawa Kohei
- Project Period (FY)
  2020 – 2022
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 16010:Astronomy-related
- Research Institution
  Waseda University
  Tohoku University
Revealing the close environment of supermassive black holes using the moonPrincipal Investigator
- Principal Investigator
  
  Ichikawa Kohei
- Project Period (FY)
  2018 – 2020
- Research Category
  
  Grant-in-Aid for Early-Career Scientists
- Review Section
  
  Basic Section 16010:Astronomy-related
- Research Institution
  Tohoku University
赤外線とX線の両波長観測から探る新しい活動銀河核種族の解明Principal Investigator
- Principal Investigator
  
  市川幸平
- Project Period (FY)
  2015 – 2016
- Research Category
  
  Grant-in-Aid for Research Activity Start-up
- Research Field
  
  Astronomy
- Research Institution
  National Astronomical Observatory of Japan

All 2024 2023 2022 2021 2020 2019 2018 2016 2015

All Journal Article Presentation

[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21H04496
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21H04490, KAKENHI-PROJECT-21H04496, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-23K25911
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K13153, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-23K03462, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21H04496
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-19KK0076, KAKENHI-PROJECT-21H04494, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21H04496, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-23K25911
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19KK0076, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22533, KAKENHI-PROJECT-23K22537
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K13154, KAKENHI-PROJECT-22K20391, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22537
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-20K14531, KAKENHI-PROJECT-17H06130, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K20240
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K03918, KAKENHI-PROJECT-21K03628, KAKENHI-PROJECT-22K14075, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-21K13968, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20K14530
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H04490, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-19K03918, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-21K13968, KAKENHI-PROJECT-21K03628, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-19K14759
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22537
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22537
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K03918, KAKENHI-PROJECT-21K03628, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-22K03670, KAKENHI-PROJECT-22K14075, KAKENHI-PROJECT-21H04490, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-22KJ0730, KAKENHI-PROJECT-21K13968, KAKENHI-PROJECT-17H04830, KAKENHI-PROJECT-21H04494, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20K14530
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K14531, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22529
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K21884, KAKENHI-PROJECT-23K20239, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01941
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20K14529, KAKENHI-PROJECT-20K14531, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-ORGANIZER-17H06357, KAKENHI-PLANNED-17H06362, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-19KK0076, KAKENHI-PROJECT-21H04496, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-20K04014, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-20K04014, KAKENHI-PROJECT-17H04830, KAKENHI-PROJECT-23K22537, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PUBLICLY-21H00032, KAKENHI-PROJECT-23K20861, KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K14529, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19K13389, KAKENHI-PROJECT-18KK0089, KAKENHI-PUBLICLY-20H04744, KAKENHI-PROJECT-19H00546, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-19K13384
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946, KAKENHI-PROJECT-19K03862, KAKENHI-PROJECT-20K14529, KAKENHI-PROJECT-20H01949, KAKENHI-PROJECT-19K14759
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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 & Astrophysics
  
  Volume: 652 Pages: A98-A98
- DOI
  10.1051/0004-6361/202141075
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20K14531
[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 & Astrophysics
  
  Volume: 652 Pages: A99-A99
- DOI
  10.1051/0004-6361/202141219
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-20K14531
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05389, KAKENHI-PROJECT-19K23437, KAKENHI-PROJECT-20H01939, KAKENHI-PROJECT-20H01946, KAKENHI-PROJECT-18K03696, KAKENHI-PROJECT-20K04016, KAKENHI-PROJECT-21K03632, KAKENHI-PROJECT-19K14752, KAKENHI-PROJECT-20K14464, KAKENHI-PROJECT-18H01251, KAKENHI-PLANNED-20H05856, KAKENHI-PUBLICLY-20H04730, KAKENHI-PROJECT-19K14759
[Journal Article] Dust Destruction by Charging: A Possible Origin of Gray Extinction Curves of Active Galactic Nuclei2020
- Author(s)
  Ryo Tazaki, Kohei Ichikawa, Mitsuru Kokubo
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 892 Issue: 2 Pages: 1-6
- DOI
  10.3847/1538-4357/ab7822
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17J01884, KAKENHI-PROJECT-17J02411, KAKENHI-PROJECT-18K13584
[Journal Article] Dust Destruction by Drift-induced Sputtering in Active Galactic Nuclei2020
- Author(s)
  Tazaki Ryo、Ichikawa Kohei
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 892 Issue: 2 Pages: 149-162
- DOI
  10.3847/1538-4357/ab72f6
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17J02411, KAKENHI-PROJECT-18K13584
[Journal Article] Obscuring Fraction of Active Galactic Nuclei Implied by Supernova and Radiative Feedbacks2020
- Author(s)
  Kawakatu Nozomu、Wada Keiichi、Ichikawa Kohei
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 889 Issue: 2 Pages: 84-84
- DOI
  10.3847/1538-4357/ab5f60
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K03918, KAKENHI-PROJECT-16H03959, KAKENHI-PROJECT-18K13584
[Journal Article] NuSTAR Discovery of Dead Quasar Engine in Arp 1872019
- Author(s)
  Ichikawa Kohei、Kawamuro Taiki、Shidatsu Megumi、Ricci Claudio、Bae Hyun-Jin、Matsuoka Kenta、Shin Jaejin、Toba Yoshiki、Ueda Junko、Ueda Yoshihiro
- Journal Title
  
  The Astrophysical Journal Letters
  
  Volume: 883 Issue: 1 Pages: 13-17
- DOI
  10.3847/2041-8213/ab3ebf
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K14759, KAKENHI-PROJECT-19K14762, KAKENHI-PROJECT-17J09016, KAKENHI-PROJECT-18J01050, KAKENHI-PROJECT-17K05384, KAKENHI-PROJECT-18K13584
[Journal Article] WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects2019
- Author(s)
  Uchiyama Mizuho、Ichikawa Kohei
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 883 Issue: 1 Pages: 6-6
- DOI
  10.3847/1538-4357/ab372e
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). II. Physical Properties Derived from the SED Fitting with Optical, Infrared, and Radio Data2019
- Author(s)
  Toba Yoshiki、Yamashita Takuji、Nagao Tohru、Wang Wei-Hao、Ueda Yoshihiro、Ichikawa Kohei、Kawaguchi Toshihiro、Akiyama Masayuki、Hsieh Bau-Ching、Kajisawa Masaru、Lee Chien-Hsiu、Matsuoka Yoshiki、Noboriguchi Akatoki、Onoue Masafusa、Schramm Malte、Tanaka Masayuki、Komiyama Yutaka
- Journal Title
  
  The Astrophysical Journal Supplement Series
  
  Volume: 243 Issue: 1 Pages: 15-37
- DOI
  10.3847/1538-4365/ab238d
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K14759, KAKENHI-PROJECT-16H03958, KAKENHI-PROJECT-18J01050, KAKENHI-PROJECT-17K05384, KAKENHI-PROJECT-18K13584, KAKENHI-PROJECT-17H06129, KAKENHI-PROJECT-17K05389
[Journal Article] BAT AGN Spectroscopic Survey XIII. The nature of the most luminous obscured AGN in the low-redshift universe2019
- Author(s)
  Bar R. E., Trakhtenbrot B., Oh K, Koss M. J., Wong O I, Ricci C., Schawinski K., Weigel A. K., Sartori L. F., Ichikawa K., Secrest N. J., Stern D., Pacucci F., Mushotzky R., Powell M. C., Ricci F., Sani E., Smith K. L., Harrison F. A., Lamperti I., Urry C. M.
- Journal Title
  
  Monthly Notices of the Royal Astronomical Society
  
  Volume: 489 Issue: 3 Pages: 3073-3092
- DOI
  10.1093/mnras/stz2309
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] A NuSTAR and XMM-Newton Study of the Two Most Actively Star-forming Green Pea Galaxies (SDSS J0749+3337 and SDSS J0822+2241)2019
- Author(s)
  Kawamuro Taiki、Ueda Yoshihiro、Ichikawa Kohei、Imanishi Masatoshi、Izumi Takuma、Tanimoto Atsushi、Matsuoka Kenta
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 881 Issue: 1 Pages: 48-48
- DOI
  10.3847/1538-4357/ab2bf6
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17J06407, KAKENHI-PROJECT-17J09016, KAKENHI-PROJECT-15K05030, KAKENHI-PROJECT-17K05384, KAKENHI-PROJECT-18K13584, KAKENHI-PLANNED-17H06362
[Journal Article] A kilometre-sized Kuiper belt object discovered by stellar occultation using amateur telescopes2019
- Author(s)
  Arimatsu K.、Tsumura K.、Usui F.、Shinnaka Y.、Ichikawa K.、Ootsubo T.、Kotani T.、Wada T.、Nagase K.、Watanabe J.
- Journal Title
  
  Nature Astronomy
  
  Volume: 3 Issue: 4 Pages: 301-306
- DOI
  10.1038/s41550-018-0685-8
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05381, KAKENHI-PROJECT-17K18789, KAKENHI-PROJECT-18K13584, KAKENHI-PROJECT-18K13606, KAKENHI-PROJECT-18KK0089, KAKENHI-PROJECT-18H01250, KAKENHI-PROJECT-18H01272
[Journal Article] Transition of BH feeding from the quiescent regime into star-forming cold disc regime2019
- Author(s)
  Inayoshi Kohei、Ichikawa Kohei、Ostriker Jeremiah P、Kuiper Rolf
- Journal Title
  
  Monthly Notices of the Royal Astronomical Society
  
  Volume: 486 Issue: 4 Pages: 5377-5390
- DOI
  10.1093/mnras/stz1189
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within 104 yr2019
- Author(s)
  Ichikawa Kohei、Ueda Junko、Bae Hyun-Jin、Kawamuro Taiki、Matsuoka Kenta、Toba Yoshiki、Shidatsu Megumi
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 870 Issue: 2 Pages: 65-65
- DOI
  10.3847/1538-4357/aaf233
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K17672, KAKENHI-PROJECT-18K13584, KAKENHI-PROJECT-17J09016, KAKENHI-PROJECT-18J01050
[Journal Article] BAT AGN Spectroscopic Survey. XI. The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei2019
- Author(s)
  Ichikawa, K., Ricci, C., Ueda, Y. et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 870 Issue: 1 Pages: 31-31
- DOI
  10.3847/1538-4357/aaef8f
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05384, KAKENHI-PROJECT-18K13584, KAKENHI-ORGANIZER-17H06357, KAKENHI-PROJECT-17F17321, KAKENHI-PROJECT-17J09016
[Journal Article] Discovery of Extreme Ionized-gas Outflow in an AKARI-selected Ultra-luminous Infrared Galaxy at z=0.52019
- Author(s)
  X. Chen, M. Akiyama, H. Noda, A.’Uf, Y. Toba, I. Yamamura, T. Kawaguchi, M. Kokubo and K. Ichikawa
- Journal Title
  
  Publications of the Astronomical Society of Japan
  
  Volume: 71 Issue: 2 Pages: 29-29
- DOI
  10.1093/pasj/psz002
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05389, KAKENHI-PROJECT-16H03954, KAKENHI-PROJECT-17J01884, KAKENHI-PROJECT-19K14759, KAKENHI-PROJECT-18J01050, KAKENHI-PROJECT-18K13584, KAKENHI-PROJECT-17H06129
[Journal Article] The origin of the mid-infrared nuclear polarization of active galactic nuclei2018
- Author(s)
  Lopez-Rodriguez E、Alonso-Herrero A、Diaz-Santos T、Gonzalez-Martin O、Ichikawa K、Levenson N A、Martinez-Paredes M、Nikutta R、Packham C、Perlman E、Ramos?Almeida C、Rodriguez-Espinosa J M、Telesco C M
- Journal Title
  
  Monthly Notices of the Royal Astronomical Society
  
  Volume: 478 Issue: 2 Pages: 2350-2358
- DOI
  10.1093/mnras/sty1197
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] The Emission and Distribution of Dust of the Torus of NGC 10682018
- Author(s)
  Lopez-Rodriguez Enrique、Fuller Lindsay、Alonso-Herrero Almudena、Efstathiou Andreas、Ichikawa Kohei、Levenson Nancy A.、Packham Chris、Radomski James、Almeida Cristina Ramos、Benford Dominic J.、Berthoud Marc、Hamilton Ryan、Harper Doyal、Kov?vcs Attila、Santos Fabio P.、Staguhn J.、Herter Terry
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 859 Issue: 2 Pages: 99-99
- DOI
  10.3847/1538-4357/aabd7b
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] Gravitational Waves from Supermassive Black Hole Binaries in Ultraluminous Infrared Galaxies2018
- Author(s)
  Inayoshi Kohei、Ichikawa Kohei、Haiman Zoltan
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 863 Issue: 2 Pages: L36-L36
- DOI
  10.3847/2041-8213/aad8ad
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Journal Article] Signs of active galactic nucleus quenching in a merger remnant with radio jets2016
- Author(s)
  K. Ichikawa, J. Ueda, M. Shidatsu, T. Kawamuro, K. Matsuoka
- Journal Title
  
  Publication of Astronomical Society of Japan
  
  Volume: Volume 68, Issue 1 Issue: 1
- DOI
  10.1093/pasj/psv112
- Peer Reviewed / Acknowledgement Compliant / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15H06831
[Journal Article] [O iii] λ5007 and X-Ray Properties of a Complete Sample of Hard X-Ray Selected AGNs in the Local Universe2015
- Author(s)
  Ueda, Y. et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 815 Issue: 1 Pages: 1-14
- DOI
  10.1088/0004-637x/815/1/1
- Peer Reviewed / Acknowledgement Compliant / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26400228, KAKENHI-PROJECT-15H02070, KAKENHI-PROJECT-15H06831
[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
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] ngVLA as first (radio) quasar excavator?2023
- Author(s)
  Kohei Ichikawa
- Organizer
  ngVLA SWG3+5 workshop, NAOJ
- Invited
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Recent observational progress on AGN and SMBH science2022
- Author(s)
  Kohei Ichikawa
- Organizer
  Galaxy-IGM workshop 2022, 釧路
- Invited
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022
- Author(s)
  Kohei Ichikawa
- Organizer
  COSPAR general assembly
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[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)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Rapidly growing supermassive black holes in extremely radio-loud galaxies2022
- Author(s)
  Kohei Ichikawa
- Organizer
  Signature of Cosmic Black Holes, Athen, Greece (hybrid)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Rapid SMBH growth in the extremely radio-loud galaxies2021
- Author(s)
  Kohei Ichikawa
- Organizer
  European Astronomical Society meeting 2021
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Serendipitous Discovery of Dying AGN in Arp 1872021
- Author(s)
  Kohei Ichikawa
- Organizer
  238th American Astronomical Society meeting
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20H01939
[Presentation] Extremely radio loud galaxies2020
- Author(s)
  Kohei Ichikawa
- Organizer
  Subaru/HSC AGN meeting
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] The beginning and ending phase of AGN2019
- Author(s)
  Kohei Ichikawa
- Organizer
  呉AGN研究会
- Invited
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Gravitational wave signals from SMBHs in Hy/ULIRGs2019
- Author(s)
  Kohei Ichikawa
- Organizer
  East Asia high-z galaxy workshop
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Seeing common or rare AGN with TMT2019
- Author(s)
  Kohei Ichikawa
- Organizer
  TMT Science Forum 2019
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] IR view of X-ray AGN: The covering factor of gas and dust in Swift/BAT AGN2019
- Author(s)
  Kohei Ichikawa
- Organizer
  Supermassive black holes: Environment and Evolution
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Discovery of Dying AGN in Arp 187: Experience of Drastic Luminosity Decline within 10^4 yr2019
- Author(s)
  Kohei Ichikawa
- Organizer
  日本天文学会2019年秋季年会
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Extremely radio-loud AGN discovered by Subaru/HSC2019
- Author(s)
  Kohei Ichikawa
- Organizer
  Extremely Big Eyes on the Early Universe 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei2019
- Author(s)
  Kohei Ichikawa
- Organizer
  日本天文学会2019年春季年会
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Observation of Supermassive Black Holes2019
- Author(s)
  Kohei Ichikawa
- Organizer
  SMBH研究推進連絡会
- Invited
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Obscured SMBH assembly using multi-wavelength and wide-field surveys2019
- Author(s)
  Kohei Ichikawa
- Organizer
  Subaru 20: Optical and Infrared Astronomy for the next Decade
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Gravitational Waves from SMBH binaries in U/HyLIRGs2019
- Author(s)
  Kohei Ichikawa
- Organizer
  EWASS 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] The Covering Factor of Dust and Gas in Swift/BAT AGN2019
- Author(s)
  Kohei Ichikawa
- Organizer
  East Asia AGN workshop 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Complete IR View of Swift/BAT AGN2019
- Author(s)
  Kohei Ichikawa
- Organizer
  AGN-Starburst meeting 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Host galaxy properties of pure-IR AGN2019
- Author(s)
  Kohei Ichikawa
- Organizer
  BASS workshop 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] WERGS: Optically-faint radio galaxies discovered by Subaru/HSC and VLA/FIRST2019
- Author(s)
  Kohei Ichikawa
- Organizer
  HSC-eROSITA meeting
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] BASS Survey: The Covering Factor of Dust and Gas in Swift/BAT AGN2018
- Author(s)
  Kohei Ichikawa
- Organizer
  TORUS2018
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] The complete IR view of the Swift/BAT 70 month AGN catalog2018
- Author(s)
  Kohei Ichikawa
- Organizer
  42nd COSPAR Assembly
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Extremely radio-loud AGN residing in low-mass galaxies discovered by HSC survey2018
- Author(s)
  Kohei Ichikawa
- Organizer
  Formation and evolution of SMBHs
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Looking at drastic AGN luminosity decline in Arp 187 within 10^4 years2018
- Author(s)
  Kohei Ichikawa
- Organizer
  5th Galaxy workshop
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] BAT AGN Spectroscopy Survey: The Covering Factor of Dust and Gas in Swift/BAT AGN2018
- Author(s)
  Kohei Ichikawa
- Organizer
  NERQUAM 2018
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Dying AGN in Arp 1872018
- Author(s)
  Kohei Ichikawa
- Organizer
  ASNY50
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K13584
[Presentation] Determining the dust torus covering factor using clumpy torus models in IR2015
- Author(s)
  Kohei Ichikawa
- Organizer
  Prospects, challenges and evolution of AGN modeling in the Astro-H Era
- Place of Presentation
  立教大学
- Year and Date
  2015-10-21
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15H06831
[Presentation] Sudden Death of AGN in Arp 187?2015
- Author(s)
  Kohei Ichikawa
- Organizer
  ALMA workshop “AGN銀河の中心1kpc → 1pcスケールでの質量降着機構の理解に向けて”
- Place of Presentation
  国立天文台
- Year and Date
  2015-12-21
- Data Source
  KAKENHI-PROJECT-15H06831

1. 山下拓時 (20800759)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
2. KAWAKATU Nozomu

# of Collaborated Projects: 0 results

# of Collaborated Products: 3 results
3. NAGAO Toru

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
4. 川室太希

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
5. 鳥羽儀樹

# of Collaborated Projects: 0 results

# of Collaborated Products: 3 results
6. 久保真理子

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
7. 内山久和

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
8. 柏川伸成

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
9. 利川潤

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
10. 今西昌俊

# of Collaborated Projects: 0 results

# of Collaborated Products: 5 results
11. 村田光司

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
12. 大坪貴文

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
13. 志達めぐみ

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
14. 泉拓磨

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
15. 野田博文

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
16. 上田佳宏

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
17. 山田智史

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
18. 川口俊宏

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
19. 米倉覚則

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Ichikawa Kohei 市川 幸平

市川 幸平 イチカワ コウヘイ

Research Projects

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Co-Researchers

Revealing the origins of optically dark radio AGNPrincipal Investigator

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Rapid supermassive black hole growth revealed by multi-wavelength surveysPrincipal Investigator

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Revealing the close environment of supermassive black holes using the moonPrincipal Investigator

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赤外線とX線の両波長観測から探る新しい活動銀河核種族の解明Principal Investigator

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[Journal Article] Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 57282024

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

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[Journal Article] BASS. XXXIV. A Catalog of the Nuclear Millimeter-wave Continuum Emission Properties of AGNs Constrained on Scales <~ 100--200 pc2023

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[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

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[Journal Article] The eROSITA final equatorial-depth survey (eFEDS): host-galaxy demographics of X-ray AGNs with Subaru Hyper Suprime-Cam2023

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[Journal Article] BASS. XXXV. The M BH-σ Relation of 105 Month Swift-BAT Type 1 AGNs2023

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[Journal Article] BASS. XLII. The Relation between the Covering Factor of Dusty Gas and the Eddington Ratio in Nearby Active Galactic Nuclei2023

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[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

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[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

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[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

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[Journal Article] The eROSITA Final Equatorial-Depth Survey (eFEDS)2022

Ichikawa Kohei 市川幸平

市川幸平イチカワコウヘイ