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Theoretical Study of Physical Processes and Interactions in Large Scale Jets

Research Project

Project/Area Number 16540215
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionOsaka University

Principal Investigator

TAKAHARA Fumio  Osaka University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (20154891)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
KeywordsRelativistic Hydrodynamics / Particle Acceleration / Shock Waves / Radio Galaxies / Synchrotron Radiation / Compton Scattering / Electron Positron Pairs
Research Abstract

X-ray emission from large scale jets is interpreted as synchrotron emission for FR-I radio galaxies and inverse Compton scattering of CMB photons for FR-II galaxies, respectively. However, quantitative estimates of bulk Lorentz factor and magnetic field strength are largely affected by internal structure of jets. Detailed investigations on Cen-A jets are made to show that particle acceleration in the interaction region between jet surface and surroundings plays an important role. We proposed a reflection model for the orphan TeV flare observed for 1959+650, which also implies the importance of internal structure of jets.
We have also made the following researches on relevant physical processes.
1.Dynamical consideration of internal shocks indicates that the rest mass density of the jet matter is about thousand times larger than that of relativistic electrons.
2.Relativistic beaming effects on apparent structure on polarization and brightness map are not simple, which should be taken into account in the interpretation of observations.
3.Klein-Nishina effect in Compton scattering can largely modify the electron spectrum and in some cases it does not necessarily lead to a strong decrease of radiation intensity.
4.We discussed the formation mechanism and instability of electron-positron beams.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (17 results)

All 2006 2005 2004

All Journal Article (17 results)

  • [Journal Article] Constraining the Emission Properties of TeV Blazer H1426+428 by the Synchrotron Self Compton Model2006

    • Author(s)
      T.Kato
    • Journal Title

      Astrophysical Journal 638・2

      Pages: 653-658

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The X-Ray Jet in Centaurus A: Clues on the Jet Structure and Particle Acceleration2006

    • Author(s)
      J.Kataoka
    • Journal Title

      Astrophysical Journal 641・1

      Pages: 158-168

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron Self-Compton Model2006

    • Author(s)
      T.Kato
    • Journal Title

      Astrophysical Journal 638-2

      Pages: 653-658

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The X-Ray Jet in Centaurus A : Clues on the Jet Structure and Particle Acceleration2006

    • Author(s)
      J.Kataoka
    • Journal Title

      Astrophysical Journal 641-1

      Pages: 158-168

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron Self-Compton Model2006

    • Author(s)
      T.Kato
    • Journal Title

      Astrophysical Journal 638・2

      Pages: 653-658

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The X-Ray Jet in Centaurus A : Clues on the Jet Structure and Particle Acceleration2006

    • Author(s)
      J.Kataoka
    • Journal Title

      Astrophysical Journal (Accepted)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Electric field screening by a proton counterflow in the pulsar polar cap2005

    • Author(s)
      K.Asano
    • Journal Title

      Astronomy and Astrophysics 428,1

      Pages: 139-148

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Compton Scattering in the Klein-Nishina Regime Revisited2005

    • Author(s)
      M.Kusunose
    • Journal Title

      Astrophysical Journal 621,1

      Pages: 285-290

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Coherent Curvature Radiation and Proton Counterflow in the Pulsar Magnetosphere2005

    • Author(s)
      K.Asano
    • Journal Title

      Astrophysical Journal 630・1

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Giant Flare of SGR 1806- 20 from a Relativistic Jet2005

    • Author(s)
      R.Yamazaki
    • Journal Title

      Publications of the Astronomical Society of Japan 57・3

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Electric field screening by a proton counterflow in the pulsar polar cap2005

    • Author(s)
      K.Asano
    • Journal Title

      Astronomy and Astrophysics 428-1

      Pages: 139-148

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Compton Scattering in the Klein-Nishina Regime Revisited2005

    • Author(s)
      M.Kusunose
    • Journal Title

      Astrophysical Journal 621-1

      Pages: 285-290

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Coherent Curvature Radiation and Proton Counterflow in the Pulsar Magnetosphere2005

    • Author(s)
      K.Asano
    • Journal Title

      Astrophysical Journal Part2 630-1

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Giant Flare of SGR 1806-20 from a Relativistic Jet2005

    • Author(s)
      R.Yamazaki
    • Journal Title

      Publications of the Astronomical Society of Japan 57-3

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Giant Flare of SGR 1806-20 from a Relativistic Jet2005

    • Author(s)
      R.Yamazaki
    • Journal Title

      Publications of the Astronomical Society of Japan 57・3

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Constraints on the energetics and plasma composition of relativistic jets in FR II sources2004

    • Author(s)
      M.Kino
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 349,1

      Pages: 336-346

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Electrostatic instability in electron-positron pairs injected in an external electric field2004

    • Author(s)
      K.Asano
    • Journal Title

      Astronomy and Astrophysics 416,3

      Pages: 1139-1147

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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