摘要：Aims. We analysed the clustering of a photometric sample of galaxy clusters selected from the Third Data Release of the KiloDegree Survey, focusing on the redshift-space two-point correlation function (2PCF). We compared our measurements to theoretical predictions of the standard Λ cold dark matter (ΛCDM) cosmological model. Methods. We measured the 2PCF of the sample in the cluster-centric radial range r ∈ [5, 80] h −1 Mpc, considering 4934 galaxy clusters with richness λ ∗ ≥ 15 in the redshift range z ∈ [0.1, 0.6]. A Markov chain Monte Carlo analysis has been performed to constrain the cosmological parameters Ωm, σ8, and S 8 ≡ σ8(Ωm/0.3)0.5 , assuming Gaussian priors on the mass-richness relation given by the posteriors obtained from a joint analysis of cluster counts and weak lensing. In addition, we constrained the normalisation of the mass-richness relation, α, with fixed cosmological parameters. Results. We obtained Ωm = 0.28+0.05 −0.04, σ8 = 0.82+0.14 −0.12, and S 8 = 0.80+0.08 −0.08. The constraint on S 8 is consistent within 1σ with the results from WMAP and Planck. Furthermore, by fixing the cosmological parameters to those provided by Planck, we obtained α = 0.12+0.06 −0.06, which is fully consistent with the result obtained from the joint analysis of cluster counts and weak lensing performed for this sample.
关键词：galaxies: clusters: general;cosmology: observations;large-scale structure of Universe;surveys
