Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing a model of variability of X-ray reprocessing features in Active
  Galactic Nuclei   A number of recent results from X-ray observations of Active Galactic Nuclei
involving the Fe K alpha line (reduction of line variability compared to the
X-ray continuum variability, the X-ray ``Baldwin effect'') were attributed to a
presence of a hot, ionized skin of an accretion disc, suppressing emission of
the line. The ionized skin appears as a result of the thermal instability of
X-ray irradiated plasma. We test this hypothesis by computing the Thomson
thickness of the hot skin on top of the 'alpha P_tot' Shakura-Sunyaev disc, by
simultaneously solving the vertical structure of both the hot skin and the
disc. We then compute a number of relations between observable quantities, e.g.
the hard X-ray flux, amplitude of the observed reprocessed component,
relativistic smearing of the K alpha line, the r.m.s. variability of the hard
X-rays. These relations can be compared to present and future observations. We
point out that this mechanism is unlikely to explain the behaviour of the X-ray
source in MCG-6-30-15, where there is a number of arguments against the
existence of a thick hot skin, but it can work for some other Seyfert 1
galaxies.

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The categories of this paper are: plasm-ph
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The categories of this paper are: math
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph