http://arxiv.org/abs/1507.00514
The very short and bright flare of 3C 279 detected with {\it Fermi}-LAT in 2013 December is tested by a model with stochastic electron acceleration by turbulences. Our time-dependent simulation shows that the very hard spectrum and asymmetric lightcurve are successfully reproduced by changing only the magnetic field from the value in the steady period. The maximum energy of electrons drastically grows by the decrease of the magnetic field, which yields hard photon spectrum as observed. Succeeding rapid cooling due to the inverse Compton scattering with the external photons reproduces the decaying feature of the lightcurve. The inferred energy density of the magnetic field is much less than the electron and photon energy densities. The low magnetic field and short variability timescale are unfavorable for the jet acceleration model by the gradual Poynting flux dissipation.
K. Asano and M. Hayashida
Fri, 3 Jul 15
1/50
Comments: Accepted by ApJ Letters, 5 pages, 5 figures
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