On the rapid TeV flaring activity of Markarian 501Markarian 501

Free access article

Issue		A&A Volume 491, Number 2, November IV 2008


Page(s)		L37 - L40
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200810505
Published online		27 October 2008

A&A 491, L37-L40 (2008)
DOI: 10.1051/0004-6361:200810505

Letter

On the rapid TeV flaring activity of Markarian 501

A. Mastichiadis and K. Moraitis

Department of Physics, University of Athens, Panepistimiopolis, GR 15783 Zografos, Greece
e-mail: amastich@phys.uoa.gr

Received 2 July 2008 / Accepted 11 October 2008

Abstract
Aims. We investigate the one-zone SSC model of TeV blazars in the presence of electron acceleration. In this picture, electrons achieve their maximum energy as the acceleration saturates due to a combination of synchrotron and inverse Compton scattering losses.
Methods. We solve the spatially averaged kinetic equations that describe the simultaneous evolution of particles and photons, obtaining the multiwavelength spectrum as a function of time.
Results. We apply the model to the rapid flare of Mrk 501 of July 9, 2005 as observed by the MAGIC telescope, and derive the relevant parameters for the pre-flare quasi-steady-state and the states during the flare. We demonstrate that a hard lag flare can be obtained with parameters well inside the range expected for this source. In particular, a high value of Doppler factor appears necessary.

Key words: galaxies: BL Lacertae objects: individual: Mrk 501 -- galaxies: jets -- gamma rays: theory -- X-rays: galaxies -- acceleration of particles -- radiation mechanisms: non-thermal

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