Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range

Details Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range

2003-06-17

arxiv.org/abs/astro-ph/0306346v1

Proc. 28th ICRC Tsukuba, 2003, pp.2309-2312

Astronomy and Astrophysics

Astrophysics

4 pages, 12 ps-figures, tsukuba.sty, to appear in the Proc. 28th International Cosmic Ray Conference (Tsukuba, Japan 2003). Mo

Scientific paper

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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