THE REAL-SPACE AND REDSHIFT SPACE CORRELATION-FUNCTIONS AT REDSHIFT Z=1 3/

Citation
Cw. Shepherd et al., THE REAL-SPACE AND REDSHIFT SPACE CORRELATION-FUNCTIONS AT REDSHIFT Z=1 3/, The Astrophysical journal, 479(1), 1997, pp. 82-89
Citations number
26
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
479
Issue
1
Year of publication
1997
Part
1
Pages
82 - 89
Database
ISI
SICI code
0004-637X(1997)479:1<82:TRARSC>2.0.ZU;2-K
Abstract
We present the results of a study of the two-point correlation functio n for a sample of field galaxies taken from the Canadian Network for O bservational Cosmology cluster survey. The sample consists of 183 gala xies within a contiguous region of sky covering 216 square arcminutes. The objects have r-band magnitudes 17.0 less than or equal to r less than or equal to 21.7 and redshifts 0.21 less than or equal to z less than or equal to 0.53. The median redshift of the sample is 0.37. We f it the real space correlation function to a power law xi(r)=(r/r(0))(- 1.7) finding r(0)=1.9(-0.4)(+0.4) h(-1) Mpc (Omega(0)=1), or r(0)=2.2( -0.4)(+0.5) h(-1) Mpc (Omega(0)=0.2); uncertainties are estimated usin g the bias-corrected boot-strap resampling method, with 300 resampling s. This low correlation length implies strong evolution has occurred i n the correlation function; if the observed correlation function is mo deled as xi(r, z)=xi(r, 0) (1+z)(-(3+epsilon)) with xi(r, 0)=(r/5.1 h( -1) Mpc)(-1.7), then epsilon approximate to 1.5. Comparison of the red shift space and real space correlation functions indicates that the on e-dimensional pairwise peculiar velocity dispersion cr at z approximat e to 0.37 is weakly inconsistent with 720 km s(-1), the value predicte d by the cosmic virial theorem if Omega(0)=1. The observed correlation functions are, however, consistent with sigma approximate to 360 km s (-1), the value expected if Omega(0)=0.2.