Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0206o&link_type=abstract
American Astronomical Society, HEAD meeting #10, #2.06
Astronomy and Astrophysics
Astronomy
Scientific paper
The Sun has recently been predicted to be an extended source of gamma-ray emission, produced by inverse-Compton (IC) scattering of cosmic-ray electrons on the solar radiation field. The emission was predicted to be extended and a confusing foreground for the diffuse extragalactic background even at large angular distances from the Sun. The solar disk is also expected to be a steady gamma-ray source. Analyzing the EGRET database, we find evidence of emission from the solar disk and its halo (Orlando and Strong 2008,arXiv:0801.2178). The observations are compared with our model for the extended emission. The spectrum of the solar disk emission and the spectrum of the extended emission have been obtained. The spectrum of the moon is also given. The observed intensity distribution and the flux are consistent with the predicted model of IC gamma-rays from the halo around the Sun. This emission is expected to be readily detectable in the future by GLAST, and we describe the perspectives for what can be learned from this upcoming mission.
Orlando Elena
Strong Andrew W.
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