The Richness-dependent Cluster Correlation Function: Early Sloan Digital Sky Survey Data

摘要: The cluster correlation function and its richness dependence are determined from 1108 clusters of galaxies—the largest sample studied so far—found in 379 deg2 Sloan Digital Sky Survey early data. results compared with previous samples optically X-ray-selected clusters. richness-dependent increases monotonically an average scale ~12 h-1 Mpc for poor to ~25 the richer, more massive a mean separation ~90 Mpc. suggest slightly stronger correlations than selected (~2 σ). large-scale cosmological simulations. observed is well represented by standard flat Λ-dominated cold dark matter (LCDM) model (Ωm 0.3, h 0.7) inconsistent considerably weaker predicted Ωm = 1 models. An analytic relation versus separation, r0-d, that best describes observations LCDM prediction r0 2.6 (for d 20-90 Mpc). Data complete Survey, when available, will greatly enhance accuracy allow precise determination parameters.