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Theoretical Study of Time Dependent Radiative Transfer in Relativistic Astrophysical Plasmas

Research Project

Project/Area Number 61540175
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionTokyo Metropolitan University (1988)
The University of Tokyo (1986-1987)

Principal Investigator

TAKAHARA Fumio  Department of Physics, Faculty of Science, Tokyo Metropolitan University, 理学部, 助教授 (20154891)

Project Period (FY) 1986 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
KeywordsRelativistic Plasmas / Accretion / Quasars / Active Galactic Nuclei / Electron-Positron Pairs / X-Ray Astronomy / Mass Loss / 放射輸送 / 降積円盤 / X線背景放射 / 高エネルギー天体物理 / ブラックホール
Research Abstract

I investigated the properties of relativistic plasmas which are produced near massive black holes in quasars and active galactic nuclei. I developed the numerical code which treats time dependent radiative transfer with Compton scattering and electron-positron pair production. I studied the time development of the instantaneously heated plasmas and found that the initial thermal energy of protons is transferred to electrons and photons on the time scale of about 10 times the initial Thomson time and about 20 percent of it is used for pair production. I also studied the stationary structure of plasma clouds and obtained the spatial distribution of proton and electron temperatures, pair concentration and photon spectra. In the central region the temperatures are lower and the pair concentration is higher than the uniform model predicts for the same heating rate. Pair atmosphere is less de veloped because of the anisotropic distribution of photons.
The results are applied to the two-temperature accretion disks, taking account of the effects of electron-positron pairs. I found that stationary solutions are not realized for high accretion rates because pair equilibrium is not established for the expected range of electron temperature and Thomson depth. The critical accretion rate corresponds to only a few percent of the Eddington luminosity when either bremsstrahlung or the Comptonization of cyclotron higher harmonics dominates the radiation process.
This result raises the problem of the behavior of the two-temperature accretion disks for high accretion rates. I examined one possibility of hydrodynamical wind blowing from hot disks in a simplified way and dound that a significant matter can be lost through the wind. A fuller investigation will be continued.

Report

(4 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • Research Products

    (39 results)

All Other

All Publications (39 results)

  • [Publications] Fumio Takahara.: ESA-251 Plasma Astrophysics proceedings of the Joint Varenna-Abastumani・International School and Workshop. 5-15 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara.: ESA-251 Placma Astrophysics proceedings of the Joint Varenna-Abastumani・International School and Workshop. 253-256 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuro Morisawa.: Monthly Notices of the Royal Astronomical Society. 228. 745-758 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masaaki Kusunose.: Publications of the Sstronomical Society of Japan. 40. 435-448 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara.: Publications of the Astronomical Society of Japan. 40. 499-510 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masaaki Kusunose.: Publications of the Astronomical Society of Japan. 41. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara.: Astrophysical Journal.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuro Morisawa.: Publications of the Astronomical Society of Japan.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 高原文郎: 核融合研究. 61. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara.: "Physics of Neutron Stars and Black Holes" Universal Academy Press, 511-514 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara.: "Big Bang,Active Galactic-Nuclei and Supernovae" Universal Academy Press, 315-328 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: "Relativistic Plasmas in Active Galactic Nuclei" ESA-251 Plasma Astrophysics proceedings of the Joint Varenna-Abastumani International School and Workshop. 5-15 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: "Monte Carlo Simulation of Particle Acceleration by Shock Waves" ESA-251 Plasma Astrophysics proceedings of the Joint Varenna-Abastumani International School and Workshop. 253-256 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuro Morisawa: "An Interpretaion of the Statistical Properties of Extragalactic radio sources with a Relativistic beaming Model" Monthly Notices of the Royal Astronomical Society. 228. 745-758 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masaaki Kusunose: "Two-Temperature Accretion Disks with Electron-Positron Pair Production" Publications of the Astronomical Society of Japan. 40. 435-448 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: "Time Development of Relativistic Thermal Plasmas" Publications of the Astronomical Society of Japan. 40. 499-510 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masaaki Kusunose: "Two-Temperature Accretion Disks in Pair Equilibrium: Effects of Unsaturated Comptonization of Soft Photons" Publications of the Astronomical Society of Japan. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Tkahara: "Winds from Hot Accretion Disks" Astrophysical Journal.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuro Morisawa: "Cosmological Evolution of Active Galactic Nuclei and X-Ray Background Radiation" Publications of the Astronomical Society of Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: "Relativistic Astrophysical Plasmas" Kakuyuugo Kennkyuu. 61.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: Physics of Neutron Stars and Black Holes. Universal Academy Press, 511-514 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Fumio Takahara: Big Bang, Active Galactic Nuclei and Supernovae. Universal Academy Press, 315-328 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masaaki Kusunose: Publicatios of the Astronomical Society of Japan. 40. 435-448 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fumio Takahara: Publications of the Astronomical Society of Japan. 40. 499-510 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Masaaki Kusunose: Publications of the Astronomical Society of Japan. 41. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fumio Takahara: Astrophysical Journal.

    • Related Report
      1988 Annual Research Report
  • [Publications] Katsuro Morisawa: Publicatons of the Astronomical Society of Japan.

    • Related Report
      1988 Annual Research Report
  • [Publications] 高原文郎: 核融合研究. 61. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fumio Takahara: "Physics of Neutron Stars and Black Holes" Universal Academy Press, 511-514 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fumio Takahara: "Big Bang,Active Galactic Nuclei and Supernovae" Universal Academy Press, 315-328 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Katsuro Morisawa: Monthly Notices of the Royal Astronomical Society. 228. 745-758 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Masaaki Kusunose: Publications of the Astronomical Society of Japan. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Fumio Takahara: Publications of the Astronomical Society of Japan.

    • Related Report
      1987 Annual Research Report
  • [Publications] Fumio Takahara: Publications of the Astronomical Society of Japan.

    • Related Report
      1987 Annual Research Report
  • [Publications] 松本敏雄,佐藤文隆 編 高原文郎: "現代の宇宙論 第3章銀河の進化" 名大出版会, (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Fumio Takahara: esa-251 Plasma Astrophysics proceedings of the joint Varenna-Abastumani international school and workshop. 5-15 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Fumio Takahara: esa-251 Plasma Astrophysics proceedings of the joint Varenna-Abastumai international school and workshop. 253-256 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Katsuro Morisawa Fumio Takahara: Monthly Notices of the Royal Astronomical Society.

    • Related Report
      1986 Annual Research Report
  • [Publications] Fumio Takahara: Publications of the Astronomical Society of Japan.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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