Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Two-Phase Pair Corona Model for Active Galactic Nuclei and X-ray
  Binaries: How to Obtain Exact Solutions   We consider two phase accretion disk-corona models for active galactic nuclei
and some X-ray binaries. We describe in detail how one can exactly solve the
polarized radiative transfer and Comptonization using the iterative scattering
method, while simultaneously solving the energy and pair balance equation for
both the cold and hot phases. We take into account Compton scattering,
photon-photon pair production, pair annihilation, bremsstrahlung, and double
Compton scattering, as well as exact reflection from the cold disk. We consider
coronae having slab geometry as well as coronae consisting of one or more well
separated active regions of cylinder or hemisphere geometry. The method is
useful for determining the spectral intensity and the polarization emerging in
different directions from disk-corona systems. The code is tested against a
Monte-Carlo code. We also compare with earlier, less accurate, work. The method
is more than an order of magnitude faster than applying Monte Carlo methods to
the same problem and has the potential of being used in spectral fitting
software such as XSPEC.

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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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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: eess
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The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an