Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic origin of the alleged extragalactic gamma-ray background
  radiation   The diffuse gamma-ray background radiation (GBR) at high Galactic latitudes
could be dominated by inverse Compton scattering (ICS) of cosmic ray (CR)
electrons on the cosmic microwave background radiation (CBR) and on starlight
(SL) in an extended CR halo of our galaxy. Assuming the locally observed CR
electron spectrum beyond a few GeV, which follows from equilibrium between
Fermi acceleration and radiative cooling, to be a universal spectrum throughout
our galaxy and its CR halo, we reproduce the observed spectral index, the
intensity and the angular dependence of the GBR, in directions away from the
galactic disk and centre, without recourse to hypothetical extragalactic
sources.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math