Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Systematic effects in the estimate of the local gamma-ray emissivity   We show in this letter that estimates of the local emissivity of
{\gamma}-rays in the GeV-TeV range suffer uncertainties which are of the same
order of magnitude as the current Fermi results. Primary cosmic-ray fluxes,
cosmic-ray propagation, interstellar helium abundance and {\gamma}-ray
production crosssections all affect the estimate of this quantity. We also show
that the so-called nuclear enhancement factor -- though widely used so far to
model the {\gamma}-ray emissivity -- is no longer a relevant quantity given the
latest measurements of the primary cosmic ray proton and helium spectra.

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The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
3
The categories of this paper are: physics