Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics and formation of obscuring tori in AGNs   We considered the evolution of a self-gravitating clumpy torus in the
gravitational field of the central mass of an active galactic nucleus (AGN) in
the framework of the N-body problem. The initial conditions take into account
winds with different opening angles. Results of our N-body simulations show
that the clouds moving on orbits with a spread in inclinations and
eccentricities form a toroidal region. The velocity of the clouds at the inner
boundary of the torus is lower than in a disk model that can explain the
observed rotation curves. We discuss the scenario of torus formation related
with the beginning of the AGN stage.

5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th