Modeling the high-energy radiation in gamma-ray binaries

Details Modeling the high-energy radiation in gamma-ray binaries Modeling the high-energy radiation in gamma-ray binaries

2009-12-18

arxiv.org/abs/0912.3722v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 5 figures, 2009 Fermi Symposium, eConf Proceedings C091122

Scientific paper

Gamma-ray binaries are orbital modulated gamma-ray sources in the Galaxy detected both at GeV and TeV energies. The high-energy radiation may come from the interaction of energetic electrons injected by a young pulsar and photons from the massive companion star. We present a model for the production of high-energy radiation where emission, absorption and pair cascading are considered. New observations of LS I +61 303 by the Fermi Space Telescope revealed an exponential cut-off in the spectrum at a few GeV, inconsistent with gamma-gamma absorption. Electrons radiating at GeV and TeV have probably two different origins. We investigate whether the emission from the unshocked pulsar wind explains the GeV component in LS I +61 303.

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