Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evaluation of Models for Diffuse Continuum Gamma Rays in EGRET Range   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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The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc