Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 1st Fermi LAT SNR Catalog: Probing the Gamma-ray Population   While supernova remnants (SNRs) are widely thought to be powerful
accelerators, evidence comes largely from a small number of well-studied cases.
Here we systematically determine the gamma-ray emission from all known Galactic
SNRs, disentangling them from the sea of Galactic cosmic rays. Using Fermi LAT
data we have characterized the GeV emission in all regions containing SNRs,
accounting for systematic uncertainties caused by source confusion, diffuse
emission modeling, and instrumental response. More than a dozen remnants are
identified through spatial extension or detection at TeV energies, with
potential associations for >40 more. From this population study, two clear
classes of gamma-ray-emitting SNRs emerge: young remnants and those interacting
with a dense medium. This large statistical sample also reveals a possible
correlation between GeV and radio flux. The growing number of identified SNRs
will help to disentangle the effects of age and environment on the aggregate
properties of SNRs at high energies.

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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex