EDP Sciences
Free access
Volume 417, Number 3, April III 2004
Page(s) 1075 - 1081
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20035615

A&A 417, 1075-1081 (2004)
DOI: 10.1051/0004-6361:20035615

A numerical model for the $\mathsf{\gamma}$-ray emission of the microquasar LS 5039

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 3 November 2003 / Accepted 6 January 2004 )

The possible association between the microquasar LS 5039 and the EGRET source 3EG J1824-1514 suggests that microquasars could also be sources of high-energy $\gamma$-rays. In this paper, we explore, with a detailed numerical model, if this system can produce the emission 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. The computed spectrum reproduces the observed spectral characteristics at very high energy.

Key words: X-rays: binaries -- stars: individual: LS 5039 -- gamma-rays: observations -- gamma-rays: theory

Offprint request: V. Bosch-Ramon, vbosch@am.ub.es

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