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Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range
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Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range
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The GALPROP model for cosmic-ray (CR) propagation produces explicit predictions for the angular distribution of Galactic diffuse gamma rays. We compare our current models with EGRET spectra for various regions of the sky. This allows a critical test of alternative hypotheses for the observed GeV excess. We show that a population of hard-spectrum gamma-ray sources cannot be solely responsible for the excess since it also appears at high latitudes; on the other hand a hard CR electron spectrum model cannot explain the gamma-ray excess in the inner Galaxy. Hence some combination of these explanations is suggested.
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