Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Bars, Bulges and Fuelling of Active Galactic Nuclei   Both fuelling of a central black hole and the build-up of bulges are -- at
least theoretically -- facilitated by non-axisymmetric potentials. It is argued
here that the recently established surface brightness division between
bulge-dominated galaxies that dominate the local type 2 AGN luminosity
function, and disk-dominated galaxies that host (at best) weak AGN can be
understood in terms of a simple bar-instability criterion.

36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th