Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Triggering Active Galactic Nuclei in galaxy clusters   We model the triggering of Active Galactic Nuclei (AGN) in galaxy clusters
using the semi- analytic galaxy formation model SAGE (?). We prescribe
triggering methods based on the ram pressure galaxies experience as they move
throughout the intracluster medium, which is hypothesized to trigger star
formation and AGN activity. The clustercentric radius and velocity distribution
of the simulated active galaxies produced by these models are compared with
that of AGN and galaxies with intense star formation from a sample of
low-redshift, relaxed clusters from the Sloan Digital Sky Survey. The ram
pressure triggering model that best explains the clustercentric radius and
velocity distribution of these observed galaxies has AGN and star formation
triggered if $2.5\times10^{-14} < P_{ram} < 2.5\times10^{-13}$ Pa and $P_{ram}
> 2P_{internal}$; this is consistent with expectations from hydrodynamical
simulations of ram-pressure induced star formation. Our results show that ram
pressure is likely to be an important mechanism for triggering star formation
and AGN activity in clusters.

29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an