Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X-ray Luminosity Function Evolution of Quasars and the Correlation
  Between the X-ray and Ultraviolet Luminosities   We explore the evolution of the X-ray luminosity function of quasars and the
intrinsic correlation between the X-ray and 2500 Angstrom ultraviolet
luminosities, utilizing techniques verified in previous works and a sample of
over 4000 quasars detected with Chandra and XMM-Newton in the range $0<z<5$. We
find that quasars have undergone significantly less evolution with redshift in
their total X-ray luminosity than in other wavebands. We then determine that
the best fit intrinsic power law correlation between the X-ray and ultraviolet
luminosities, of the form $L'_{\rm X} \propto ({L'_{\rm UV}})^{\gamma}$, is
$\gamma=0.28\pm$0.03, and we derive the luminosity function and density
evolution in the X-ray band. We discuss the implications of these results for
models of quasar systems.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int