Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy X-ray emission from recurrent novae in quiescence: T CrB   We present Suzaku X-ray observations of the recurrent nova T CrB in
quiescence. T CrB is the first recurrent nova to be detected in the hard-X-ray
band (E ~ 40.0 keV) during quiescence. The X-ray spectrum is consistent with
cooling-flow emission emanating from an optically thin region in the boundary
layer of an accretion disk around the white dwarf. The detection of strong
stochastic flux variations in the light curve supports the interpretation of
the hard X-ray emission as emanating from a boundary layer.

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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int