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Issue A&A
Volume 418, Number 3, May II 2004
Page(s) 947 - 958
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034261



A&A 418, 947-958 (2004)
DOI: 10.1051/0004-6361:20034261

Synthetic X-ray light curves of BL Lacs from relativistic hydrodynamic simulations

P. Mimica1, M. A. Aloy1, E. Müller1 and W. Brinkmann2

1  Max-Planck-Institut für Astropysik, Postfach 1312, 85741 Garching, Germany
2  Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany

(Received 2 September 2003 / Accepted 12 February 2004 )

Abstract
We present the results of relativistic hydrodynamic simulations of the collision of two dense shells in a uniform external medium, as envisaged in the internal shock model for BL Lac jets. The non-thermal radiation produced by highly energetic electrons injected at the relativistic shocks is computed following their temporal and spatial evolution. The acceleration of electrons at the relativistic shocks is parametrized using two different models and the corresponding X-ray light curves are computed. We find that the interaction time scale of the two shells is influenced by an interaction with the external medium. For the chosen parameter sets, the efficiency of the collision in converting dissipated kinetic energy into the observed X-ray radiation is of the order of one percent.


Key words: galaxies: BL Lac objects: general X-rays: general galaxies: quasars: general -- radiation mectranisms: non-thermal -- acceleration of particles -- methods: numerical

Offprint request: P. Mimica, pere@mpa-garching.mpg.de

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