Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-08-27
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Chapter to be published in the book of proceedings of the 1st Sant Cugat Forum on Astrophysics, "ICREA Workshop on the high-en
Scientific paper
The past decade has presented a revolution in the field of observational high energy gamma-ray astrophysics with the advent of a new generation in ground-based TeV telescopes and subsequent GeV space telescopes. The Fermi Large Area Telescope (LAT) was launched in August 2008 and has offered unprecedented sensitivity and survey capabilities in the 30 MeV - 300 GeV energy range. Presented here are the results from the first two years of LAT observations of galactic binary systems including the definitive detections of LSI+61 303, LS 5039 and Cyg X-3. These sources and others are discussed in context with their known TeV and X-ray properties. The LAT data provides new understandings and pose new questions about the nature of these objects. The identification of an exponential cutoff in the spectra of both LSI+61 303 and LS 5039 was unexpected and poses challenges for explaining the emission mechanisms and processes which are in operation within these systems.
Dubois Richard
Fermi-LAT collaboration on behalf of the
Hill Adam B.
Torres Diego F.
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