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Diffuse gamma-ray emission: lessons and perspectives

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arxiv astro-ph/0509414 v1 pith:YR2L3TTZ submitted 2005-09-15 astro-ph hep-ph

Diffuse gamma-ray emission: lessons and perspectives

classification astro-ph hep-ph
keywords diffuseemissiongamma-rayannihilationgalacticmuchsourcesable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Galactic diffuse emission is potentially able to reveal much about the sources and propagation of cosmic rays (CR), their spectra and intensities in distant locations. It can possibly unveil WIMP dark matter (DM) through its annihilation signatures. The extragalactic background may provide vital information about the early stages of the universe, neutralino annihilation, and unresolved sources (blazars?) and their cosmological evolution. The gamma-ray instrument EGRET on the CGRO contributed much to the exploration of the Galactic diffuse emission. The new NASA Gamma-ray Large Area Space Telescope (GLAST) is scheduled for launch in 2007; study of the diffuse gamma-ray emission is one of the priority goals. We describe current understanding of the diffuse emission and its potential for future discoveries.

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