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Paper: Anisotropic Pair Cascading in Gamma-Ray Binaries
Volume: 422, High Energy Phenomena in Massive Stars
Page: 41
Authors: Cerutti, B.; Dubus, G.; Henri, G.
Abstract: Massive stars are thought to play a major role in the formation of the high energy radiation observed in gamma-ray binary systems. The star provides a source of seed photons for inverse Compton scattering on very high energy electrons and pair production with very high energy gamma-rays. In LS 5039, a simple one zone leptonic model can describe the main spectral and temporal features at high energies. However, this model does not account for the flux detected by H.E.S.S. at superior conjunction, where strong photon-photon absorption is expected. Emission from an electromagnetic cascade was proposed to solve this discrepancy. Previous works pointed out the importance of the stellar magnetic field and the primary source location in the development of an efficient cascade. We report on our investigation of the generation of cascade radiation in LS 5039, taking into account the full complexity arising from anisotropic effects in pair creation and inverse Compton scattering.
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