Synchrotron self-compton emission by relativistic electrons under stochastic acceleration: Application to Mrk 421 and Mrk 501

Jun Kakuwa, Kenji Toma, Katsuaki Asano, Masaaki Kusunose, Fumio Takahara

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We examine the applicability of the stochastic electron acceleration to two high synchrotron peaked blazars, Mrk 421 and Mrk 501, assuming synchrotron self-Compton emission of gamma-rays. Our model considers an emitting region moving at relativistic speed, where nonthermal electrons are accelerated and attain a steady-state energy spectrum together with the photons they emit. The kinetic equations of the electrons and photons are solved numerically, given a stationary wavenumber spectrum of the magnetohydrodynamic (MHD) disturbances, which are responsible for the electron acceleration and escape. Our simple formulation appears to reproduce the two well-sampled, long-term averaged photon spectra. In order to fit the model to the emission component from the radio to the X-ray bands, we need both a steeper wave spectral index than theKolmogorov spectrum and efficient particle escape. Although the model provides a natural explanation for the high-energy cutoff of the electron energy distribution, the derived physical parameters raise a problem with an energy budget if theMHD waves with the Alfvén velocity are assumed to be the acceleration agent.

Original languageEnglish
Pages (from-to)551-558
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume449
Issue number1
DOIs
Publication statusPublished - 2015 Feb 23

Keywords

  • Acceleration of particles
  • BL lacertae objects: individual: Mrk 421
  • BL lacertae objects: individual: Mrk 501
  • Radiation mechanisms: non-thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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