Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Companions of Qsos at Redshift 1.1   We discuss broad- and narrow-band imaging of 7 arcmin fields of 14 QSOs with
redshift ~1.1. The narrow-band filters were chosen to detect redshifted [O II]
3727A, and the broad bands are R and I, which correspond to rest wavelengths
{}~3300A and ~3800A. In 100 arcsec subfields surrounding the QSOs, we detect an
excess of typically 15 detected objects over the background of 25. Several of
the QSO subfields also contain an excess of blue (R-I < 1.0) galaxies compared
with the other subfields. Finally, several of the QSO subfields contain an
excess of galaxies with significant narrow-band flux compared with the other
subfields, and many of these are also blue. Most of the QSOs are radio-quiet in
a region of sky overpopulated with z=1.1 QSOs, and 3 others are radio-loud from
other parts of the sky. We suggest that most of these z=1.1 QSOs are in compact
groups of starbursting galaxies. In our data, there is no significant
difference between radio-loud and radio-quiet QSOs. We discuss cosmic
evolutionary implications.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int