Spatial correlations in a redshift survey of APM galaxy clusters

Abstract

view Abstract Citations (148) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spatial Correlations in a Redshift Survey of APM Galaxy Clusters Dalton, G. B. ; Efstathiou, G. ; Maddox, S. J. ; Sutherland, W. J. Abstract We have constructed a new catalog of rich clusters of galaxies by applying an objective selection algorithm to the APM Galaxy Survey. We have measured redshifts for 173 clusters from this catalog leading to a redshift survey of over 200 rich APM clusters with z <~ 0.1 when we include published redshifts. The mean space density for this subsample is n^bar^ = 2.4 x 10^-5^ h^3^ Mpc^-3^, i.e., about four times the mean space density of R>= 1 Abell clusters. The spatial correlation function for our redshift sample can be approximated by ξ_cc_(s) = (r_0_/s)^2^ with r_0_ = 12.9 +/- 1.4 h^-1^ Mpc. The correlation length for the 93 richest clusters in our sample is r_0_ = 14 +/- 4 h^-1^ Mpc. These results are consistent with the amplitude for ξ_cc_ expected in the standard cold dark matter model on scales <~ 10 h^-1^ Mpc and are lower than the amplitude (r_0_ ~ 25 h^-1^ Mpc) found by Bahcall & Soneira from the Abell catalog. However, our results indicate more clustering than expected in the standard cold dark matter model on scales >~ 10 h^-1^ Mpc. We argue that the APM cluster catalog is more homogeneous than the Abell sample, and we demonstrate that our redshift-space correlation function is free from spurious large-scale anisotropies and is compatible with small (<~500 km s^-1^) cluster peculiar velocities. Publication: The Astrophysical Journal Pub Date: May 1992 DOI: 10.1086/186357 Bibcode: 1992ApJ...390L...1D Keywords: Galactic Clusters; Red Shift; Spatial Distribution; Astronomical Catalogs; Astronomical Models; Dark Matter; Sky Surveys (Astronomy); Astrophysics; COSMOLOGY: DISTANCE SCALE; GALAXIES: CLUSTERING full text sources ADS |