EDP Sciences
Free access
Volume 425, Number 3, October III 2004
Page(s) 1069 - 1074
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20041185

A&A 425, 1069-1074 (2004)
DOI: 10.1051/0004-6361:20041185

$\gamma$-ray emission from microquasars: A numerical model for LSI +61 $^{\circ}$303

V. Bosch-Ramon and J. M. Paredes

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
    e-mail: vbosch@am.ub.es; jmparedes@ub.edu

(Received 29 April 2004 / Accepted 24 June 2004 )

We explore the possible association between the microquasar LSI +61 $^{\circ}$303 and the EGRET source 2CG 135+01/3EG J0241+6103 by studying, with a detailed numerical model, whether this system can produce the emission and the variability detected by EGRET ( >100 MeV) through inverse Compton (IC) scattering. Our numerical approach considers a population of relativistic electrons entrained in a cylindrical inhomogeneous jet, interacting with both the radiation and the magnetic fields, taking into account the Thomson and Klein-Nishina regimes of interaction. Our results reproduce the observed spectral characteristics and variability at $\gamma$-rays, thus strengthening the identification of LSI +61 $^{\circ}$303 as a high-energy $\gamma$-ray source.

Key words: X-rays: binaries -- stars: individual: LSI +61 $^{\circ}$303 -- gamma-rays: observations -- gamma-rays: theory

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