Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disk/corona model of the mean spectra of radio-quiet and radio-loud QSO   We test the disk/corona model of Janiuk et al. (2000) against the composite
mean optical/UV/soft X-ray spectrum of radio loud and radio quiet quasars from
Laor et al. (1997) which applies to faint quasars. The model well represents
the optical/UV continuum if the hardening of the locally emitted spectrum is
included, with the color to effective temperature ratio $f \sim 2$ in the inner
20-30 Schwarzschild radii. Comptonization seen in the soft X-ray band is well
explained by the adopted corona model in the case of radio loud objects.
However, this Comptonization is much stronger in radio quiet objects and
additional ad hoc assumed Comptonizing medium must be present. We speculate
that perhaps in both types of quasars there is a strong outflow of the hot
plasma; this plasma is collimated in radio loud objects but not collimated in
the radio quiet objects so it is present along the line of sight, serving as
the required Comptonizing medium. Hard X-ray power law is not explained by the
model and it may come from non-thermal component of electron plasma, as it is
the case for galactic black holes in their soft states.

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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
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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: cs
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph