Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galaxy Populations and Evolution in Clusters II: Defining Cluster
  Populations   This paper presents quantitative techniques for studying, in an unbiased
manner, the photometric and structural properties of galaxies in clusters,
including a means to identify likely background objects in the absence of
redshift information. We develop self-consistent and reproducible measurements
of fundamental properties of galaxies such as radius, surface brightness,
concentration of light and structural asymmetry. We illustrate our techniques
through an application to deep UBR images, taken with the WIYN 3.5m telescope,
of the central ~173 arcmin^2 (or 0.3 Mpc * 0.3 Mpc) of the cluster Abell 0146
(Perseus). Our techniques allow us to study the properties of the galaxy
population in the center of Perseus down to M_B = -11. Using these methods, we
describe and characterize a well-defined relation between absolute magnitude
and surface brightness for galaxy cluster members across the entire range of
galaxy luminosity from M_B = -20 to M_B = -11. The galaxies that are assigned
by our techniques to the background show no such tight relationship between
apparent magnitude and surface brightness, with the exception of those we
identify as being members of a background cluster of galaxies at z ~ 0.55. We,
however, find that at the fainter magnitudes, M_B > -16, there is a large
scatter about the underlying color--magnitude relation defined by the brighter
galaxies. Our analysis also indicates that the vast majority of Perseus
galaxies are `normal', with little evidence for features associated with
evolution; we however discuss the detailed properties of a handful of unusual
galaxies. Finally, the galaxy luminosity function of the Perseus cluster center
is computed, with a derived faint end slope of alpha = -1.44+/-0.04, similar to
values found in other nearby clusters.

1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc