Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Clustering and light profiles of galaxies in the environment of 20 Ultra
  Steep Spectrum Radio sources   We have analyzed galaxy properties in the neighborhood of 20 Ultra-Steep
Spectrum Radio sources (USS) taken from the WISH catalog of De Breuck et al.
(2002). Galaxies in these USS fields were identified in deep observations that
were carried out in the K'-band using the OSIRIS imager at the CTIO 4m
telescope. We find a statistically significant signal of clustering around our
sample of USS. The angular extension of the detected USS-galaxy clustering is
theta_c~20" corresponding to a spatial scale ~120 h^{-1}kpc, assuming the
sources are at z~1 in a Omega_m=0.3, Omega_{\Lambda}=0.7 model universe. These
results are in agreement with those obtained by Best (2000) for radio
galaxy-galaxy correlation, and Best et al. (2003) for radio-loud AGN-galaxy
correlation. We have also analyzed the light distribution of the galaxies by
fitting Sersic's law profiles. Our results show no significant dependence of
the galaxy shape parameters on the projected distance to the USS.

19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph