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Revealing the close environment of supermassive black holes using the moon

Research Project

Project/Area Number 18K13584
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionTohoku University

Principal Investigator

Ichikawa Kohei  東北大学, 学際科学フロンティア研究所, 助教 (40756293)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Discontinued (Fiscal Year 2020)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsブラックホール / 超巨大ブラックホール / 赤外線 / エックス線 / 時間分解能 / 太陽系外縁天体 / 食 / 干渉効果 / 活動銀河核 / 月
Outline of Final Research Achievements

We first applied the light curve fitting by the occultation event by a target, we first applied the light curve fitting to the large amount of the light curve data of stars to find a possible occultation of the trans Neptunian object. We have succeeded finding candidate and whose estimated size turned out to be the order of km. This result is summarized and published in the Nature Astronomy (Arimatsu et al. 2019). For the next step, we have also summarized the properties of one AGN catalog in the local universe, and this was also published in the Astrophysical Journal (Ichikawa et al. 2019).

Academic Significance and Societal Importance of the Research Achievements

今回得られた成果は、今まで行われてきた大口径望遠鏡によってターゲットを高空間分解してシャープなイメージを得る手法とは独立して、時間変動を見ることで、その変動が実は空間情報を保持している点において、非常にユニークな手法となっている。これは今後時間変動観測が重要となることを示唆しており、そのコストは比較的安価に済むこともわかっている。今後コストが非常にかかり国際的なプロジェクトとなっている大口径望遠鏡とは異なり、比較的安価に時間分解能を向上した観測装置を作ることが重要であること、一部のアマチュア天文学者でも同様の観測が可能であることを提示できた点は非常に大きいと言える。

Report

(3 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Research-status Report
  • Research Products

    (48 results)

All 2020 2019 2018 Other

All Int'l Joint Research (7 results) Journal Article (16 results) (of which Int'l Joint Research: 12 results,  Peer Reviewed: 16 results,  Open Access: 5 results) Presentation (21 results) (of which Int'l Joint Research: 16 results,  Invited: 4 results) Remarks (4 results)

  • [Int'l Joint Research] Columbia University/STScI/NASA(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Peking University(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Diego Portales(チリ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Columbia University/NASA Ames Research Center/National Optical Astronomy Observatory(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Universidad Diego Portales(チリ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Peking University(中国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Seoul National University(韓国)

    • Related Report
      2018 Research-status Report
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [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

    • Related Report
      2019 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). 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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [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

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Extremely radio loud galaxies2020

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Subaru/HSC AGN meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] WERGS: Optically-faint radio galaxies discovered by Subaru/HSC and VLA/FIRST2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      HSC-eROSITA meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [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
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Gravitational Waves from SMBH binaries in U/HyLIRGs2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      EWASS 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Complete IR View of Swift/BAT AGN2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      AGN-Starburst meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seeing common or rare AGN with TMT2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      TMT Science Forum 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [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
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [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
    • Related Report
      2019 Annual Research Report
  • [Presentation] Observation of Supermassive Black Holes2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      SMBH研究推進連絡会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Extremely radio-loud AGN discovered by Subaru/HSC2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Extremely Big Eyes on the Early Universe 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Host galaxy properties of pure-IR AGN2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      BASS workshop 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Gravitational wave signals from SMBHs in Hy/ULIRGs2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      East Asia high-z galaxy workshop
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] The Covering Factor of Dust and Gas in Swift/BAT AGN2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      East Asia AGN workshop 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [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
    • Related Report
      2018 Research-status Report
  • [Presentation] The beginning and ending phase of AGN2019

    • Author(s)
      Kohei Ichikawa
    • Organizer
      呉AGN研究会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] BASS Survey: The Covering Factor of Dust and Gas in Swift/BAT AGN2018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      TORUS2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Extremely radio-loud AGN residing in low-mass galaxies discovered by HSC survey2018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      Formation and evolution of SMBHs
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] The complete IR view of the Swift/BAT 70 month AGN catalog2018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      42nd COSPAR Assembly
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Dying AGN in Arp 1872018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      ASNY50
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] BAT AGN Spectroscopy Survey: The Covering Factor of Dust and Gas in Swift/BAT AGN2018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      NERQUAM 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Looking at drastic AGN luminosity decline in Arp 187 within 10^4 years2018

    • Author(s)
      Kohei Ichikawa
    • Organizer
      5th Galaxy workshop
    • Related Report
      2018 Research-status Report
  • [Remarks] 史上初、太陽系の果てに極めて小さな始原天体を発見

    • URL

      https://www.tohoku.ac.jp/japanese/2019/01/press-20190125-02-KBO.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 史上初、太陽系の果てに極めて小さな始原天体を発見

    • URL

      http://www.sci.tohoku.ac.jp/news/20190129-10060.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 最期を迎えた超巨大ブラックホールの発見 死を迎えても輝きを失わないブラックホール

    • URL

      http://www.sci.tohoku.ac.jp/news/20190401-10163.html

    • Related Report
      2018 Research-status Report
  • [Remarks] Active Galactic Nucleus caught in the act of dying

    • URL

      http://www.sci.tohoku.ac.jp/english/news/20190401-10200.html

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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