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Magnetohydrodynamical Structure in the Vicinity of a Black Hole

Research Project

Project/Area Number 62540176
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionIbaraki University

Principal Investigator

YOKOSAWA Masayoshi  Ibaraki University, Faculty of Science Assistant Professor, 理学部, 助教授 (30158357)

Co-Investigator(Kenkyū-buntansha) 須藤 靖  茨城大学, 理学部, 助手 (20206569)
田中 靖夫  茨城大学, 教育学部, 教授 (30007520)
石塚 俊久  茨城大学, 理学部, 助教授 (70007558)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
KeywordsActive Galaxy / Black Hole / Energy Extraction / Magnetohydrodynamics / ブラック・ホール / 降着円盤 / 磁気流体波 / 電磁流体
Research Abstract

1. Extraction process of black holes spin energy and magnetohydrodynamical structure around a Kerr black hole are studied by an exact nonstationary solution for the variation of magnetic field with a given axially symmetric accretion. Initially homogeneous magnetic field lines are twisted by the frame-dragging effect, thus exerting a torque on a infalling plasma. This hydromagnetic extraction of a black holes spin energy is analyzed on the assumption of equipartition between the magnetic and kinetic energies of a falling plasma. In order to examine the possible structure of the magnetic field formed around the hole we investigate precisely the structure of the nonstationary magnetic field produced by the stationary accretion. The strongly winding field is formed around the event horizon and then the horizon is seen as wrapped by a bundle of magnetic field lines. The evolution of a rotating black hole immersed in a magnetized plasma and electric energy generation caused by the interaction of magnetized infalling plasma with the accretion disk are discussed.
2. In order to make clear the focusing of the energy and momentum by wave motion, the wave propagation of a sound wave were investigated in curved space-time. By using a canonical-type formulation for the hydrodynamical disturbances in accretion disk, the basic properties of sound wave propagation and the numerical calculations of motion of the locus of simultaneous fronts of wave packets were preseted. The sound waves inside the potentials hi-11 converge into the rotation axis of the black hole.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Masayoshi Yokosawa: "Klein paradox in a Kerr Black Hole Immersed in a Magnetic Field" Proceedings of the 20-th Yamada Conference on Big Bang,Active Galactic Nuclei and Supernovae. 381-382 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Masayoshi Yokosawa: "Momentum Transport by Wavetrains in Inhomogeneous,Moving Media" Physics of Fluid. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tatsuo Yoshida: "The Shock Structure in the Presence of Cosmic Rays and Magnetohydrodynamic Waves" Publication of Astronomical Society in Japan. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Masayoshi Yokosawa: "Energy Extraction from a Kerr Black Hole by Magnetized plasma" Publication of Astronomical Society in Japan. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Masaaki Takahashi: "Geodesics of Sound Waves and Their Wave Fronts in Curved Space-time" Progress of Theoretical Physics. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Yokosawa: "Klein Paradox in a Kerr Black Hole Immersed in a Magnetic Field" Proceeding of the 20-th Yamada Conference on Big Bang, Active Galactic Nuclei and Supernovas 381-382, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Yokosawa: "Momentum Transport by Wavetrains in Inhomogeneous, Moving Media" Physics of Fluid 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Yoshida: "The Shock Structure in the Presence of Cosmic Rays and Magnetohydrodynamic Waves" Publication of Astronomical Society in Japan 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Yokasawa: "Energy Extraction from a Kerr Black Hole by Magnetized Plasma" Publication of Astronomical Society in Japan 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Takahashi: "Geodesics of Sound Waves and Their Wave Fronts in Curved Space-time" Progress of Theoretical Physics 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Masayoshi Yokosawa: "Klein Paradox in a Kerr Black Hole Immersed in a Magnetic Field" Proceedings of the 20-th Yamada Conference on Big Bang, Active Galctic Nuclei and Supernoavae. 381-382 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Masayoshi Yokosawa: "Momentum Transport by Wavetrains in Inhomogeneous,Moving Media" Physics of Fluid,1989.

    • Related Report
      1989 Annual Research Report
  • [Publications] Tatsuo Yoshida: "The Shock Structure in the Presence of Cosmic Rays and Magnetohydrodynamic Waves" Publication of Astronomical Society in Japan.

    • Related Report
      1989 Annual Research Report
  • [Publications] Masayoshi Yokosawa: "Energy Extraction from a Kerr Black Hole by Magnetized Plasma" Publication of Astronomical Society in Japan.

    • Related Report
      1989 Annual Research Report
  • [Publications] Masaaki Takahashi: "Geodesics of Sound Waves and Their Wave Fronts in Curved Space-time" Progress of Theoretical Physics,1990.

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Yokosawa: Proceedings of the YAMADA Conference XX on Big Bang Active Galactic Nuclei and Supernovae. 381-382 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Yokosawa: Astrophysics and Space Sience. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Yoshida: Publication of Astronomical Society in Japan. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Takahashi: Progress of Theoretical Physics. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Suto: The Astrophysical Journal. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Yoshikawa: Progress of Theoretical Physics. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] M.Yokosawa: Physics of Fluids. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] T.Yashida: Publication of Astronomical Society in japan. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Y.Tanaka: Proceeding of I.A.U.Col.″Atmospheric Diagnostics of Stellar Evolution,Chemical Peculiarity,Mass Loss and Explosion ed.Nomoto. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] T.Iahizuka: 茨城大学教育学部紀要. 37. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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