The Las Campanas Redshift Survey Results: The Redshift-Space Autocorrelation Function

Abstract

Presented are measurements from the Las Campanas Redshift Survey (LCRS) of the galaxy-galaxy autocorrelation function in redshiftspace,ξ_gg(s). For separations 2.0h^-1 Mpc < s < 16.4h^-1 Mpc, ξ_gg(s) can be approximated by a power law with slope γ=-1.52 ± 0.03 and correlation length s_o = 6.28 ± 0.27h^-1 Mpc. A zero-crossing occurs on scales of ~30–40 h ^-1 Mpc. On larger scales, ξ_gg(s) fluctuates closely about zero, indicating a high level of uniformity in the galaxy distribution on these scales. In addition, a selection effect inherent to the LCRS - the 55 arcsec galaxy pair separation limit - is tested and found to have little impact on the measurement of ξ_gg(s).