Extended solar emission - an analysis of the EGRET data

Details Extended solar emission - an analysis of the EGRET data Extended solar emission - an analysis of the EGRET data

2007-04-03

arxiv.org/abs/0704.0462v1

AIP Conf.Proc.921:502-503,2007

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, Proceedings of the First GLAST Symposium, February 5-8, 2007, Stanford University

Scientific paper

10.1063/1.2757422

The Sun was recently predicted to be an extended source of gamma-ray emission, produced by inverse-Compton scattering of cosmic-ray electrons with the solar radiation. The emission was predicted to contribute to the diffuse extragalactic background even at large angular distances from the Sun. While this emission is expected to be readily detectable in future by GLAST, the situation for available EGRET data is more challenging. We present a detailed study of the EGRET database, using a time dependent analysis, accounting for the effect of the emission from 3C 279, the moon, and other sources, which interfere with the solar signal. The technique has been tested on the moon signal, with results consistent with previous work. We find clear evidence for emission from the Sun and its vicinity. The observations are compared with our model for the extended emission.

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