ABSORPTION OF GAMMA-RAYS BY X-RAY PHOTONS AROUND AN ACCRETION BINARY SOURCE

Simulation calculations have been made Lo examine the modification eff ect of a hot X-ray photon field on a gamma-ray spectrum by the photon- photon pair production and inverse Compton scattering processes. The C yg X-3 system was used as a paradigm. It is shown that a gamma-ray spe ctrum can change significantly when passing through the ambient keV X- ray photon field of an accretion binary source. For Cyg X-3, a signifi cant amount of r-rays originated near the central source in the range of 10(2)-10(4) MeV could be absorbed by the extended X-ray photons fro m accretion disk corona in a high X-ray luminosity state and, on the o ther hand, the inverse Compton effect of secondary electrons could cau se a considerable increase in intensity of gamma-rays between approxim ately 10 MeV and approximately 50 MeV. The relevance of the absorption effect for observations is discussed.