Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernova remnants and candidates detected in the XMM-Newton M31 large
  survey   We present the analysis of supernova remnants (SNRs) and candidates in M31
identified in the XMM-Newton large programme survey of M31. SNRs are among the
bright X-ray sources in a galaxy. They are good indicators of recent star
formation activities of a galaxy and of the interstellar environment in which
they evolve. By combining the X-ray data of sources in M31 with optical data as
well as with optical and radio catalogues, we aim to compile a complete,
revised list of SNRs emitting X-rays in M31 detected with XMM-Newton, study
their luminosity and spatial distribution, and understand the X-ray spectrum of
the brightest SNRs. We analysed the X-ray spectra of the twelve brightest SNRs
and candidates using XMM-Newton data. The four brightest sources allowed us to
perform a more detailed spectral analysis and the comparison of different
models to describe their spectrum. For all M31 large programme sources we
searched for optical counterparts on the Ha, [Sii], and [Oiii] images of the
Local Group Galaxy Survey. We confirm 21 X-ray sources as counterparts of known
SNRs. In addition, we identify five new X-ray sources as X-ray and optically
emitting SNRs. Seventeen sources are no longer considered as SNR candidates. We
have thus created a list of 26 X-ray SNRs and 20 candidates in M31 based on
their X-ray, optical, and radio emission, which is the most recent complete
list of X-ray SNRs in M31. The brightest SNRs have X-ray luminosities of up to
8 x 10^36 erg/s in the 0.35 - 2.0 keV band.

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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cs