Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Active galactic nuclei and massive galaxy cores   (Context) Central active galactic nuclei (AGN) are supposed to play a key
role in the evolution of their host galaxies. In particular, the dynamical and
physical properties of the gas core must be affected by the injected energy.
  (Aims) Our aim is to study the effects of an AGN on the dark matter profile
and on the central stellar light distribution in massive early type galaxies.
  (Methods) By performing self-consistent N-body simulations, we assume in our
analysis that periodic bipolar outbursts from a central AGN can induce harmonic
oscillatory motions on both sides of the gas core.
  (Results) Using realistic AGN properties, we find that the motions of the gas
core, driven by such feedback processes, can flatten the dark matter and/or
stellar profiles after 4-5 Gyr. These results are consistent with recent
observational studies that suggest that most giant elliptical galaxies have
cores or are "missing light" in their inner part. Since stars behave as a
"collisionless" fluid similar to dark matter, the density profile both of stars
and dark matter should be affected in a similar way, leading to an effective
reduction in the central brightness.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph