Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray emitting-absorbing media in Seyfert 1 galaxies   Seyfert galaxies have been shown to exhibit a large variety of features in
their X-ray spectra from which the environment of the central engine can be
deduced. We focus on the two following aspects: the Warm Absorber, mainly
responsible of the soft X-ray properties, and the reprocessing/reflecting
plasma medium at the origin of the iron Kalpha fluorescent line. The physical
parameters and the location of the so-called Warm Absorber (WA), a photoionized
medium along the line of sight to the nuclear region, are more strongly
constrained by optical coronal lines than by the oxygen edges observed in the
soft X-rays and produced by the WA. The photoionization models also predict the
intensities of the X-ray emission lines which are going to be detected with the
new generation of X-ray satellites. An alternative model to the relativistic
accretion disc is proposed to explain the profile of the X-ray iron Kalpha line
observed in the Seyfert 1. This line can be formed in the framework of a
quasi-spherical accretion of optically thick clouds. An optically thick
photoionization code coupled with a Monte-Carlo code has been developed to
compute the entire spectrum from the IR to the hard X-rays for a close geometry
with a large covering factor. The multiple Compton reflections allow to
reproduce the redshifted broad iron line as detected in several Seyfert 1
galaxies and in MCG-6-30-15.

11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc