Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Galaxy Environment of Quasars in the z~1.3 Clowes-Campusano Large
  Quasar Group   We report significant associated clustering in the field of a z=1.226 quasar
from the Clowes-Campusano LQG in the form of both a factor ~11 overdensity of
I-K>3.75 galaxies and red sequences of 15-18 galaxies at I-K~4.3, V-K~6.9
indicative of a population of massive ellipticals at the quasar redshift. The
quasar is located between two groups of these galaxies, with further clustering
extending over 2-3 Mpc. A band of V-I<1 galaxies bisects the two groups of red
sequence galaxies, and we suggest that the merging of these two groups has
triggered both this band of star-formation and the quasar.

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The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin