High-energy gamma-rays from massive close binaries

Computer Science

Scientific paper

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Close Binaries, Gamma Rays

Scientific paper

High-energy γ-rays can be produced by particles accelerated by young pulsars in binary systems, or by particles accelerated by shocks, which are formed in collisions of stellar and pulsar winds inside the massive binaries. If the star is very luminous and the γ-ray photons are injected relatively close to its surface, they may create an e+e- pair in a collision with the soft photons coming from the star itself. The secondary e+e- pairs lose energy in different processes. When the inverse Compton scattering (ICS) dominates, the cascade in an anisotropic radiation field can develop. We discuss the propagation of the VHE photons in the thermal anisotropic radiation field of the massive star. The γ-ray light curves seen by an observer located at different directions with respect to the plane of the binary system for which a VHE γ-ray emission has been detected are discussed too.

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