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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1311.0936 (astro-ph)
[Submitted on 5 Nov 2013 (v1), last revised 23 Nov 2013 (this version, v2)]

Title:Time-Dependent Models for Blazar Emissions with the Second-Order Fermi Acceleration

Authors:Katsuaki Asano, Fumio Takahara, Masaaki Kusunose, Kenji Toma, Jun Kakuwa
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Abstract:The second-order Fermi acceleration (Fermi-II) driven by turbulence may be responsible for the electron acceleration in blazar jets. We test this model with time-dependent simulations. The hard electron spectrum predicted by the Fermi-II process agrees with the hard photon spectrum of 1ES 1101-232. For other blazars that show softer spectra, the Fermi-II model requires radial evolution of the electron injection rate and/or diffusion coefficient in the outflow. Such evolutions can yield a curved electron spectrum, which can reproduce the synchrotron spectrum of Mrk 421 from the radio to the X-ray this http URL photon spectrum in the GeV energy range of Mrk 421 is hard to fit with a synchrotron self-Compton model. However, if we introduce an external radio photon field with a luminosity of $4.9 \times 10^{38}~\mbox{erg}~\mbox{s}^{-1}$, GeV photons are successfully produced via inverse Compton scattering. The temporal variability of the diffusion coefficient or injection rate causes flare emission. The observed synchronicity of X-ray and TeV flares implies a decrease of the magnetic field in the flaring source region.
Comments: 34 pages, 15 figures, accepted for publication in the Astrophysical Journal
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1311.0936 [astro-ph.HE]
  (or arXiv:1311.0936v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1311.0936
Related DOI: https://doi.org/10.1088/0004-637X/780/1/64

Submission history

From: Katsuaki Asano [view email]
[v1] Tue, 5 Nov 2013 00:40:54 UTC (941 KB)
[v2] Sat, 23 Nov 2013 02:54:02 UTC (941 KB)
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