Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The symbiotic system in quasars: black hole, accretion disk and jet   The UV continuum spectrum of quasars and AGN is assumed to originate from an
accreting disk surrounding a massive rotating black hole. We discuss the
structure and emission spectra of a disk which drives a powerful jet. Due to
the large efficiency of extracting energy from the accreting matter in the
inner part of the disk close to the massive object, all the energetic
conditions for the formation of jets are fulfilled. The total energy going up
into the jet depends strongly on the Kerr black hole parameters, on the disk
features and on the mass flow and thickness of the jet. The shape of UV spectra
of the AGN can be explained by a sub-Eddington accretion disk which drives a
jet in the innermost parts.

5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th