Population Studies of Unidentified High-Energy Gamma-Ray Sources
The third EGRET catalog contains ~ 170 unidentified high energy gamma-ray point sources. Here we report that this group contains two populations with different spatial distributions, flux distributions and spectral properties. A cluster of ~ 20 sources lies just north of the Galactic Center and is part of a larger population of faint objects at mid-latitudes. We show that these mid-latitude sources are distinct from the population of bright sources found at lower latitudes. The spatial distribution of the mid-latitude population suggests a Gould belt origin.
KeywordsGamma-ray: observations Gamma-ray sources: unidentified
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