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高周波VLBIによる銀河系中心の巨大ブラックホール Sgr A*の放射機構の解明

Research Project

Project/Area Number 12J07566
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

秋山 和徳  東京大学, 理学系研究科, 特別研究員(DC1)

Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2014: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2013: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2012: ¥900,000 (Direct Cost: ¥900,000)
Keywords国際情報交換(アメリカ) / 国際研究者交流(アメリカ) / ブラックホール / SgrA* / 電波天文学 / VLBI / VERA / EHT / M87 / サブミリ波 / ミリ波 / Sgr A* / NRAO 530 / 3C 279 / Event Horizon Telescope
Outline of Annual Research Achievements

平成25年度と同様、報告者はEHTを主導するマサチューセッツ工科大学ヘイスタック天文台に3ヶ月間滞在し、EHTの観測データを使った研究を行った。研究内容の一つであるブラックホールの直接撮像に関連して、Sgr A*と並びブラックホールの直接撮像の実現が期待されるEHTの最重要ターゲット天体の一つであるM87のブラックホールの事象の地平面の周囲の構造に新たな制限を当たれることに成功し、60名を越す国際研究グループの筆頭著者として論文にまとめた。論文は現在投稿されておりまもなく受理される見込みである。この成果に関して報告者は国際学会で招待講演を行った他、国内学会でも口頭講演を行った。
また採用1年目に行ったSgr A*の較正天体であるNRAO 530のEHTの観測成果に関して、結果の再解析やデータの確認等を行い、投稿論文にまとめた。この成果の中では報告者の独自の着想により天体画像の解析に電波干渉計では用いられたことないマルコフ連鎖モンテカルロ法を用いたベイズ推定が用いられており、今後のサブミリ波VLBIでの天体画像の取得方法の選択肢の一つとして現在検討されている。また本観測はブレーザーと呼ばれる活動銀河核の種族において、ブラックホールから噴出する相対論的ジェット中でのガンマ線の爆発的増光現象の最中に1.3 mm帯で超高空間分解能撮像に成功した初めての観測である。この観測によってガンマ線放射領域のサイズの測定に成功したほか、放射領域付近のジェットの構造や物理的なパラメータに強い制限をおくことに成功している。
以上の成果をまとめた学位論文は東京大学において高い評価を受け、報告者は東京大学大学院理学系研究科の研究奨励賞を受賞したほか、学位授与式において東京大学大学院理学系研究科の総代へ選出された。また本学位論文は文系・理系問わず東京大学内で高く評価され、東京大学総長賞を受賞した。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • Research Products

    (39 results)

All 2015 2014 2013 2012 Other

All Journal Article (15 results) (of which Peer Reviewed: 11 results,  Acknowledgement Compliant: 1 results,  Open Access: 3 results) Presentation (23 results) (of which Invited: 3 results) Remarks (1 results)

  • [Journal Article] Magnetization degree at the jet base of M87 derived from the event horizon telescope data: testing magnetically driven jet paradigm2015

    • Author(s)
      Kino, M.; Takahara, F.; Hada, K.; Akiyama, K.; Nagai, H.; Sohn, B. W.
    • Journal Title

      The Astrophysical Journal

      Volume: 803 Issue: 1 Pages: 30-30

    • DOI

      10.1088/0004-637x/803/1/30

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Probing Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz2015

    • Author(s)
      Koyama, Shoko; Kino, Motoki; Doi, Akihiro; Niinuma, Kotaro; Hada, Kazuhiro; Nagai, Hiroshi; Honma, Mareki; Akiyama, Kazunori; Giroletti, Marcello; Giovannini, Gabriele; Orienti, Monica; Isobe, Naoki; Kataoka, Jun; Paneque, David; Kobayashi, Hideyuki; Asada, Keiichi
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 未定 Issue: 4

    • DOI

      10.1093/pasj/psu144

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] VLBI observations of bright AGN jets with the KVN and VERA Array (KaVA): Evaluation of imaging capability2015

    • Author(s)
      Niinuma, Kotaro; Lee, Sang-Sung; Kino, Motoki; Sohn, Bong Won; Akiyama, Kazunori et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 66 Issue: 6 Pages: 103-118

    • DOI

      10.1093/pasj/psu104

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A strong radio brightening at the jet base of M87 in the period of the elevated TeV gamma-ray state in 20122015

    • Author(s)
      Hada, K. ; Giroletti, M. ; Kino, M. ; Giovannini, G. ; D'Ammando, F. ; Cheung, C. C. ; Beilicke, M. ; Nagai, H. ; Doi, A. ; Akiyama, K. ; Honma, M. ; Niinuma, K. ; Casadio, C. ; Orienti, M. ; Krawczynski, H. ; Gomez, J. L. ; Sawada-Satoh, S. ; Koyama, S. ; Cesarini, A. ; Nakahara, S. ; Gurwell, M. A.
    • Journal Title

      2014 Fermi Symposium proceedings

      Volume: eConf

    • Related Report
      2014 Annual Research Report
  • [Journal Article] Super-resolution imaging with radio interferometry using sparse modeling2014

    • Author(s)
      Honma, Mareki ; Akiyama, Kazunori ; Uemura, Makoto ; Ikeda, Shiro
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 66 Issue: 5 Pages: 95-95

    • DOI

      10.1093/pasj/psu070

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Strong Radio Brightening at the Jet Base of M 87 during the Elevated Very High Energy Gamma-Ray State in 20122014

    • Author(s)
      Hada, K.; Giroletti, M.; Kino, M.; Giovannini, G.; D'Ammando, F.; Cheung, C. C.; Beilicke, M.; Nagai, H.; Doi, A.; Akiyama, K.; Honma, M.; Niinuma, K.; Casadio, C.; Orienti, M.; Krawczynski, H.; Gomez, J. L.; Sawada-Satoh, S.; Koyama, S.; Cesarini, A.; Nakahara, S.; Gurwell, M. A.
    • Journal Title

      The Astrophysical Journal

      Volume: 788 Issue: 2 Pages: 165-177

    • DOI

      10.1088/0004-637x/788/2/165

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Long-term monitoring of Sgr A* at 7 mm with VERA and KaVA2014

    • Author(s)
      Akiyama, K. ; Kino, M. ; Sohn, B. ; Lee, S. ; Trippe, S. ; Honma, M.
    • Journal Title

      Proceedings of the International Astronomical Union

      Volume: 303 Issue: S303 Pages: 288-292

    • DOI

      10.1017/s1743921314000751

    • Related Report
      2014 Annual Research Report
  • [Journal Article] Measuring Mass Accretion Rate onto the Supermassive Black Hole in M87 Using Faraday Rotation Measure with the Submillimeter Array2014

    • Author(s)
      Kuo, C., Asada, K., Rao, R., Nakamura, M., Algaba, J., Liu, H., Inoue, M., Koch, P., Ho, P., Matsushita, S., Pu, H., Akiyama, K., Nishioka H. and Pradel. N.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 783, Issue 2 Issue: 2 Pages: 5-5

    • DOI

      10.1088/2041-8205/783/2/l33

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multi-Epoch VERA Observations of Sagittarius A*. I. Images and Structural Variability2013

    • Author(s)
      Akiyama, K., Takahashi, R., Honma, M., Oyama, T., and Kobay ashi, H.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 65 No.4 Issue: 4 Pages: 13-13

    • DOI

      10.1093/pasj/65.4.91

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fine-scale Structure of the Quasar 3C 279 Measured with 1.3 mm Very Long Baseline Interferometry2013

    • Author(s)
      Lu, R., Fish, V., Akiyama, K., Doeleman, S., Algaba, J., Bower, G., Brinkerink, C., Chamberlin, R., Crew, G., Cappallo, R., Dexter, M., Freund, R., Friberg, P., Gurwell, M., Ho, P., Honma, M., et al
    • Journal Title

      The Astrophysical Journal

      Volume: 772 Issue 1 Issue: 1 Pages: 10-10

    • DOI

      10.1088/0004-637x/772/1/13

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The GENJI Programme : Gamma-Ray Emitting Notable AGN Monitoring by Japanese VLBI2013

    • Author(s)
      Nagai, H., Kino, M., Niinuma, K., Akiyama K., Hada, K., Koyama, S., Orienti M., Hiura, K., Sawada-Satoh S., Honma, M., Giovannini, G., Giroletti, M., Shibata, K. and Sorai, K.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 65 Issue: 2 Pages: 14-14

    • DOI

      10.1093/pasj/65.2.24

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Radio and γ-ray follow-up of the exceptionallyhigh-activity state of PKS 1510-089 in 20112013

    • Author(s)
      Monika Orienti
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 428 Issue: 3 Pages: 2418-2429

    • DOI

      10.1093/mnras/sts201

    • Related Report
      2013 Annual Research Report 2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] VERA monitoring of a blazar OJ 2872013

    • Author(s)
      Sawada-Satoh, S., Akiyama, K., Kino, M., Nagai, H. and Niinuma, K.
    • Journal Title

      EPJ Web of Conferences

      Volume: 61 Pages: 8007-8007

    • DOI

      10.1051/epjconf/20136108007

    • Related Report
      2013 Annual Research Report
  • [Journal Article] ALMA Continuum Spectrum of the M87 Nucleus. Quasi-simultaneous continuum observations at bands-3,6,7, and 92013

    • Author(s)
      Doi, A., Hada, K., Nagai, H., Kino, M., Honma, M., Akiyama, K., Oyama and T., Kono, Y.
    • Journal Title

      EPJ Web of Conferences

      Volume: 61 Pages: 8008-8008

    • DOI

      10.1051/epjconf/20136108008

    • Related Report
      2013 Annual Research Report
  • [Journal Article] GENJI Programne: Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI2013

    • Author(s)
      Hiroshi Nagai
    • Journal Title

      PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN

      Volume: 65

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] Image Reconstruction with the Sparse Modeling and Exchange Monte Carlo(仮題)2015

    • Author(s)
      Kazunori Akiyama
    • Organizer
      mm VLBI Data Processing Workshop
    • Place of Presentation
      オランダ・ライデン
    • Year and Date
      2015-06-08 – 2015-06-11
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Event Horizon Telescopeで探るM87の事象の地平面の構造2015

    • Author(s)
      秋山和徳
    • Organizer
      「第26回ブラックホール地平面勉強会」研究会
    • Place of Presentation
      神奈川県・宇宙航空研究開発機構宇宙科学研究所
    • Year and Date
      2015-04-10
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] EHTで探るM87の超巨大ブラックホール最近傍の構造 II2015

    • Author(s)
      秋山和徳
    • Organizer
      日本天文学会春期年会
    • Place of Presentation
      大阪大学
    • Year and Date
      2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] Event-horizon-scale structure of M87 in the middle of the VHE enhancement in 20122014

    • Author(s)
      Kazunori Akiyama
    • Organizer
      EHT 2014
    • Place of Presentation
      カナダ・Perimeter Institute
    • Year and Date
      2014-11-11
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] New observations of M87 with the Event Horizon Telescope in March 20122014

    • Author(s)
      Akiyama, K.
    • Organizer
      International Workshop : Understanding Relativistic Jets by Polarimetry and Synergetic Study from Radio to TeV
    • Place of Presentation
      広島大学
    • Year and Date
      2014-03-23
    • Related Report
      2013 Annual Research Report
  • [Presentation] Event Horizon Telescope (230GHzVLBI)で探る巨大電波銀河M87のTeVγ線活動期間中における超巨大ブラックホール最近傍の構造2014

    • Author(s)
      秋山和徳, R. Lu, V. Fish, S. Doeleman, 秦和弘, 新沼浩太郎, 紀基樹, 永井洋, 本間希樹
    • Organizer
      日本天文学会2014年春期年会
    • Place of Presentation
      国際基督教大学, 東京都
    • Year and Date
      2014-03-21
    • Related Report
      2013 Annual Research Report
  • [Presentation] VERA/KaVAで探る銀河系中心の巨大ブラックホールへのガス降着現象2014

    • Author(s)
      秋山和徳, 紀基樹, B, Sohn, S, Lee, S. Trippe, S. Doeleman, M. Giroletti, 本間希樹
    • Organizer
      日本天文学会2014年春期年会
    • Place of Presentation
      国際基督教大学, 東京都
    • Year and Date
      2014-03-21
    • Related Report
      2013 Annual Research Report
  • [Presentation] Probing the gas cloud encounter to Sgr A* with VERA/KaVA current result and future prospects2014

    • Author(s)
      Akiyama, K.
    • Organizer
      6th KaVA Joint Science Working Group Meeting
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2014-01-20
    • Related Report
      2013 Annual Research Report
  • [Presentation] Data analysis report of 1 Gbps data correlated with KJCC2014

    • Author(s)
      Akiyama, K.
    • Organizer
      6th KaVA Joint Science Working Group Meeting
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2014-01-20
    • Related Report
      2013 Annual Research Report
  • [Presentation] 東アジアVLBI観測網で探る銀河系中心のブラックホールへのガス降着現象2013

    • Author(s)
      秋山和徳
    • Organizer
      2013年度VLBI懇談会シンポジウム
    • Place of Presentation
      筑波大学
    • Year and Date
      2013-12-24
    • Related Report
      2013 Annual Research Report
  • [Presentation] Long-term monitoring of Sgr A^* at 43GHz with VERA and KVN+VER A2013

    • Author(s)
      Akiyama, K.
    • Organizer
      The Galactic Center Black Hole Laboratory
    • Place of Presentation
      Granada, Spain
    • Year and Date
      2013-11-19
    • Related Report
      2013 Annual Research Report
  • [Presentation] VERA and KaVA (KVN+VERA) observations of Sgr A^* in 20132013

    • Author(s)
      秋山和徳
    • Organizer
      第11回水沢VLBI観測所ユーザーズミーティング
    • Place of Presentation
      国立天文台, 東京都
    • Year and Date
      2013-10-03
    • Related Report
      2013 Annual Research Report
  • [Presentation] Long-term monitoring of Sgr A* at 43GHz with VERA and KVN+VER A2013

    • Author(s)
      Akiyama, K.
    • Organizer
      The Galactic Center : Feeding and Feedback in a Normal Galactic Nucleus
    • Place of Presentation
      New Mexico, USA
    • Year and Date
      2013-10-02
    • Related Report
      2013 Annual Research Report
  • [Presentation] How should we have a look at the"dinner" of the galacticsuper nassive black-hole Sgr A* with East Asian facilities?2013

    • Author(s)
      秋山和徳
    • Organizer
      山口大学-北海道大学合同研究会
    • Place of Presentation
      山口大学(山口県)
    • Year and Date
      2013-03-15
    • Related Report
      2012 Annual Research Report
  • [Presentation] 1. 3 mm VLBI observations of 3C 279 and NRAO 530 with Event Horizon Telescope2012

    • Author(s)
      秋山和徳
    • Organizer
      2012年度VLBI懇談会シンポジウム
    • Place of Presentation
      NICT (東京都)
    • Year and Date
      2012-12-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] Microarcsecond structures of FSRQs 3C 279 and NRAO 530revealed by EHT observations2012

    • Author(s)
      秋山和徳
    • Organizer
      East-Asian sub-mm VLBI workshop
    • Place of Presentation
      国立天文台(東京都)(招待講演)
    • Year and Date
      2012-12-11
    • Related Report
      2012 Annual Research Report
  • [Presentation] Microarcsecond structures of FSRQs 3C 279 and NRAO 530revealed by Event Horizon Telescope observations2012

    • Author(s)
      秋山和徳
    • Organizer
      New trends in radia as t ronomy in ALMA era
    • Place of Presentation
      箱根プリンスホテル(神奈川県)
    • Year and Date
      2012-12-03
    • Related Report
      2012 Annual Research Report
  • [Presentation] Review on recent scientific results of Event Horizon Telescope(1.3 mm VLBI) observations2012

    • Author(s)
      秋山和徳
    • Organizer
      第10回水沢VLBI観測所ユーザーズミーティング
    • Place of Presentation
      国立天文台(東京都)
    • Year and Date
      2012-10-04
    • Related Report
      2012 Annual Research Report
  • [Presentation] ミリ・サブミリ波VLBIによる活動銀河核の研究2012

    • Author(s)
      秋山和徳
    • Organizer
      Large Aperture Mi 11imeter/Submillimeter Telescopesin the ALMA era
    • Place of Presentation
      国立天文台(東京都)(招待講演)
    • Year and Date
      2012-09-29
    • Related Report
      2012 Annual Research Report
  • [Presentation] Event Horizon Telescope で探るフレーザーNRAO 530 のγ線フレア後の1. 3 mm (230 GHz)におけるサブパーセクスケールの構造2012

    • Author(s)
      秋山和徳
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      大分大学(大分県)
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] Event Horizon Telescope を用いた1.3mm(230 GHz)VLBI によるブレーザー3C 279 のファースト・モデルイメージ2012

    • Author(s)
      秋山和徳
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      大分大学(大分県)
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] GENJIプログラム:3C 454. 3の2010年11月のγ線フレア後の電波帯での多周波ライトカーブ2012

    • Author(s)
      秋山和徳
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      大分大学(大分県)
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] Event Horizon Telescopeで探るFSRQ3C 279/NRAO 530のμasスケールの構造2012

    • Author(s)
      秋山和徳
    • Organizer
      VLBI workshop 「巨大ブラックホールからの噴出流」
    • Place of Presentation
      国立天文台(東京都)
    • Year and Date
      2012-09-06
    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://www.miz.nao.ac.jp/submilli/contect/pr2012/c01

    • Related Report
      2012 Annual Research Report

URL: 

Published: 2013-04-25   Modified: 2024-03-26  

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