Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Two-Point Correlation Function at Redshift 1/3   We present the results of a study of the two-point correlation function for a
sample of field galaxies taken from the CNOCI cluster survey. The sample
consists of 144 galaxies within a contiguous region of space subtending 225
square arcminutes. The objects have r-band magnitudes 17.0 < r < 21.7 and
redshifts 0.21 < z < 0.53. The median redshift of the sample is 0.36. The real
space correlation function is found to be consistent with a power law \xi(r) =
(r/r_0)^-1.7 with r_0 = 2.1 +0.6/-0.3 (\Omega_0=1), or r_0 = 2.5 +0.7/-0.4
(\Omega_0=0.2). Uncertainties are estimated using the bias-corrected bootstrap
resampling method, with 300 resamplings. This low correlation length implies
strong evolution since z~0.36 has occurred in either the correlation function
or the luminosity function; if the observed correlation function is modeled as
\xi(r,z) = \xi(r,0) * (1+z)^-(3+\epsilon) with \xi(r,0) = (r/5.1 h^-1Mpc)^-1.7,
then \epsilon = 0.8 +1.0/-1.3. Comparison of the redshift space and real space
correlation function indicates that the one-dimensional pairwise peculiar
velocity dispersion \sigma at z~0.36 is weakly inconsistent with 770 km s^-1,
the value predicted by the Cosmic Virial Theorem if \Omega_0=1. The observed
correlation function is, however, consistent with \sigma=400 km s^-1, the value
expected if \Omega_0=0.2.

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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom