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2 results

  • Hardening of the X-ray spectrum and signature of Fe abundance in Mrk 501 based on the filamentary jet model

  • Yasuko S. Honda, Mitsuru Honda
  • Journal:
    Proceedings of the International Astronomical Union / Volume 9 / Issue S304 / October 2013
    Published online by Cambridge University Press:
    25 July 2014, pp. 413-414
    Print publication:
    October 2013
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  • We evaluate the synchrotron spectrum of Mrk 501 based on our filamentary jet model. Integrating the contribution from the magnetic fields induced by numerous current filaments with various transverse sizes, we reproduce the observed hardening of the spectrum around X-rays. It is found that the spectral change during 1997-1998 can be explained by the evolution of turbulence. We also propose that the observed dip around 80 keV is attributed to bound-free absorption by Fe atoms, which implies the abundance of heavy nuclei at the tip of the jet.

  • Collisionless shocks and particle acceleration: Lessons from studies of heliospheric shocks

  • Toshio Terasawa
  • Journal:
    Proceedings of the International Astronomical Union / Volume 6 / Issue S274 / September 2010
    Published online by Cambridge University Press:
    08 June 2011, pp. 214-219
    Print publication:
    September 2010
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  • Acceleration processes at astrophysical collisionless shocks are reviewed with a special emphasis on the importance of in situ observations of heliospheric shocks. Topics to be included are nonlinear reaction of shock acceleration process, effect of neutral particles, and electron acceleration.