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Acceleration regions in jets from supermassive black holes probed by a next-generation international VLBI network

Research Project

Project/Area Number 18K13592
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

秦 和弘  国立天文台, 水沢VLBI観測所, 助教 (60724458)

Project Period (FY) 2018-04-01 – 2019-03-31
Project Status Discontinued (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsブラックホール / 超長基線電波干渉計(VLBI) / 活動銀河核 / 相対論的ジェット / 電波天文学 / 超長基線電波干渉計(VLBI)
Outline of Annual Research Achievements

活動銀河中心核における相対論的ジェットの生成・加速・収束機構の解明は天文学における重要課題である。本研究では、1mm帯国際VLBI観測網(EHT)による根元の超高解像度観測と、東アジアVLBIネットワーク(EAVN)による下流の高頻度モニターを組合せることで、世界に先駆けてジェット加速領域の観測的解明を試みる。そのために、M87をはじめとする近傍の重要ジェット天体を精力的に観測する。そして研究代表者がこれまでに明らかにした収束領域の観測結果と今回の加速領域の観測結果を結びつけることで、現在最も有力とされるジェット理論「磁場駆動型モデル」の妥当性に決着をつける。

平成30年度前半の目標はM87のEHT及びEAVNにおける観測の着実な実施であったが、無事当初の予定通り観測を行うことができた。EHTについてはあいにく天候条件が悪く質の良いデータは期待できないと思われるが、一方でEAVNについてはKaVAとTianmaに加えウルムチ、日立、高萩、更にはイタリアメディチーナ局も定常的に参加するなど、当初の予定を上回る規模の高品質なEAVNモニター観測を実現することができた。観測データは現在韓国テジョンにて相関処理が行われている最中であり、年度後半からは解析にとりかかる予定である。平成30年10月8日に国際共同研究強化(B)採択による重複制限が発生したため、若手研究は以上を以って辞退する。

研究費はパソコンの購入、本課題関連研究に関する国際学会発表のための旅費(研究代表者及び研究協力者1名)等に使用した。

Report

(1 results)
  • 2018 Annual Research Report
  • Research Products

    (17 results)

All 2018 Other

All Int'l Joint Research (4 results) Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Int'l Joint Research] 韓国天文研究院(韓国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] 上海天文台/新疆天文台(中国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] イタリア電波天文学研究所(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ハーバード大学/マサチューセッツ工科大学(米国)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] A new solution to the plasma starved event horizon magnetosphere. Application to the forked jet in M872018

    • Author(s)
      Punsly B.、Hardcastle M.、Hada K.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 614 Pages: A104-A104

    • DOI

      10.1051/0004-6361/201732215

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Revealing the Nature of Blazar Radio Cores through Multifrequency Polarization Observations with the Korean VLBI Network2018

    • Author(s)
      Park Jongho、Kam Minchul、Trippe Sascha、Kang Sincheol、Byun Do-Young、Kim Dae-Won、Algaba Juan-Carlos、Lee Sang-Sung、Zhao Guang-Yao、Kino Motoki、Shin Naeun、Hada Kazuhiro、Lee Taeseok、Oh Junghwan、Hodgson Jeffrey A.、Sohn Bong Won
    • Journal Title

      The Astrophysical Journal

      Volume: 860 Issue: 2 Pages: 112-112

    • DOI

      10.3847/1538-4357/aac490

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Collimation, Acceleration, and Recollimation Shock in the Jet of Gamma-Ray Emitting Radio-loud Narrow-line Seyfert 1 Galaxy 1H0323+3422018

    • Author(s)
      Hada Kazuhiro、Doi Akihiro、Wajima Kiyoaki、D’Ammando Filippo、Orienti Monica、Giroletti Marcello、Giovannini Gabriele、Nakamura Masanori、Asada Keiichi
    • Journal Title

      The Astrophysical Journal

      Volume: 860 Issue: 2 Pages: 141-141

    • DOI

      10.3847/1538-4357/aac49f

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A wide and collimated radio jet in 3C84 on the scale of a few hundred gravitational radii2018

    • Author(s)
      Giovannini, G., 他計25名(M. Honma 14番目)
    • Journal Title

      Nature Astronomy

      Volume: in press Issue: 6 Pages: 472-477

    • DOI

      10.1038/s41550-018-0431-2

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence of Jet?Clump Interaction: A Flip of the Radio Jet Head of 3C 842018

    • Author(s)
      Kino M.、Wajima K.、Kawakatu N.、Nagai H.、Orienti M.、Giovannini G.、Hada K.、Niinuma K.、Giroletti M.
    • Journal Title

      The Astrophysical Journal

      Volume: 864 Issue: 2 Pages: 118-118

    • DOI

      10.3847/1538-4357/aad6e3

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] VERA monitoring of the radio jet 3C?84 in the period of 2007?2013: Detection of non-linear motion2018

    • Author(s)
      Hiura Koichiro、Nagai Hiroshi、Kino Motoki、Niinuma Kotaro、Sorai Kazuo、Chida Hikaru、Akiyama Kazunori、D’Ammando Filippo、Giovannini Gabriele、Giroletti Marcello、Hada Kazuhiro、Honma Mareki、Koyama Shoko、Orienti Monica、Orosz Gabor、Sawada-Satoh Satoko
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 5

    • DOI

      10.1093/pasj/psy078

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Observations of nearby relativistic jets with EAVN and EATING VLBI2018

    • Author(s)
      Hada, K.
    • Organizer
      Perseus in Sicily: from black hole to cluster outskirt IAU 342
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Collimation, Acceleration, and Recollimation Shock in the Jet of Gamma-Ray Emitting Radio-loud Narrow-line Seyfert 1 Galaxy 1H0323+3422018

    • Author(s)
      Hada, K.
    • Organizer
      Half a century of blazars and beyond
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current status of EAVN-EHT campaign 2017-20182018

    • Author(s)
      Hada, K.
    • Organizer
      East Asia VLBI Workshop 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] EAVN observations near-in-time with EHT for M87 in 20172018

    • Author(s)
      Cui, Y., Hada, K., Honma, M.
    • Organizer
      East Asia VLBI Workshop 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] EAVNステータス20182018

    • Author(s)
      秦和弘
    • Organizer
      水沢VLBI観測所ユーザーズミーティング2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Expanding VLBI in East Asia and AGN Science2018

    • Author(s)
      Hada, K.
    • Organizer
      EVN Symposium 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] M87 at low frequencies2018

    • Author(s)
      Hada, K. and Markoff, S.
    • Organizer
      EHT Collaboration Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2022-06-07  

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