Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Role of Major Mergers and Nuclear Star Formation in Nearby Obscured
  Quasars   We investigate the triggering mechanism and the structural properties of
obscured luminous active galactic nuclei from a detailed study of the
rest-frame $B$ and $I$ HST images of 29 nearby ($z\approx 0.04-0.4$) optically
selected type 2 quasars. Morphological classification reveals that only a
minority (34%) of the hosts are mergers or interacting galaxies. More than half
(55%) of the hosts contain regular disks, and a substantial fraction (38%), in
fact, are disk-dominated ($B/T\lesssim 0.2$) late-type galaxies with low Sersic
indices ($n < 2$), which is characteristic of pseudo bulges. The prevalence of
bars in the spiral host galaxies may be sufficient to supply the modest fuel
requirements needed to power the nuclear activity in these systems. Nuclear
star formation seems to be ubiquitous in the central regions, leading to
positive color gradients within the bulges and enhancements in the central
surface brightness of most systems.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga