Rapid TeV flaring in Markarian 501

Abstract

We investigate rapid TeV flaring in Markarian 501 in the frame of a time-dependent one-zone synchrotron self-Compton model. In this model, electrons are accelerated to extra-relativistic energy through the stochastic particle acceleration and evolve with time, and non-thermal photons are produced by both synchrotron and inverse Comtpon scattering off synchrotron photons. Moreover, non-thermal photons during a pre-flare are produced by the relativistic electrons in the steady state and those during a flare are produced by the electrons whose injection rate is changed during some time interval. We apply the model to the rapid flare of Markarian 501 on 2005 July 9, and obtain the multi-wavelength spectra during the pre-flare and during the flare. Our results show that the timedependent properties of flares can be reproduced by varying the injection rate of electrons and a clear canonical counterclockwise loop can be given. © 2011. The American Astronomical Society.