Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic Gamma-Ray Halo of the Nearby Starburst Galaxy NGC 253   Recently, the CANGAROO-II telescope detected diffuse TeV gamma-ray emission
from a nearby edge-on starburst galaxy, NGC 253. The emission mechanism is
discussed in this report. We review the emissions of radio-to-TeV gamma-rays
from NGC 253, and present a model of the non-thermal emissions due to
synchrotron radiations and inverse Compton scatterings. A halo model
successfully explains the multiband spectrum of NGC 253.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int