Abstract
The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Observatory has surveyed the sky for high energy gamma-ray emission and has observed emission from several different source classes including active galaxies, pulsars, solar flares, and gamma-ray bursts. In addition to these discrete sources, EGRET’s improved angular resolution and statistics combined with its low instrumental background has allowed observations with unprecedented detail of the diffuse gamma-ray emission of Galactic and extragalactic origin. This paper (i) reviews a model of the diffuse high-energy Galactic gamma-ray emission based on the interaction of cosmic-rays with matter and lower energy photons that is used in the analysis of EGRET data; (ii) reviews EGRET observations of interstellar molecular clouds, particularly those in Ophiuchus; (iii) reviews EGRET observations of the Large and Small Magellanic Clouds and the implications these observations have for the origin of cosmic-rays; and (iv) reports on preliminary analysis of the isotropic component of the diffuse gamma-ray emission which is presumably of extragalactic origin.
Published Version
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