Gamma rays from compton scattering in the jets of microquasars : Application to LS 5039

摘要: Recent High Energy Stereoscopic System (HESS) observations show that microquasars in high-mass systems are sources of very high energy γ-rays. A leptonic jet model for microquasar γ-ray emission is developed. Using the head-on approximation Compton cross section and taking into account angular effects from star's orbital motion, we derive expressions to calculate spectrum γ-rays when nonthermal electrons scatter photons stellar radiation field. The scattered accretion disk also derived by approximating as a point source located behind jet. Numerical results compared with simpler obtained using δ-function approximations sections, which beaming factors derived. Calculations presented power-law distributions assumed be isotropically distributed comoving frame applied LS 5039. We conclude (1) TeV measured HESS cannot result only (CSSR), but could synchrotron self-Compton (SSC) or combination CSSR SSC; (2) fitting both data EGRET claimed associated 5039 requires improbable hard electron distribution. Because would variable model, sets unlikely representative simultaneously spectrum. therefore attribute primarily SSC emission. Detection periodic modulation favor cascade hadron origin inner jet, whereas stochastic variability alone support more extended model. puzzle will quickly solved GLAST.