AMICO galaxy clusters in KiDS-DR3: Constraints on cosmological parameters and on the normalisation of the mass-richness relation from clustering
Abstract
Aims: We analysed the clustering of a photometric sample of galaxy clusters selected from the Third Data Release of the Kilo-Degree 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 S8 ≡ 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 S8 = 0.80+0.08−0.08. The constraint on S8 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.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- September 2022
- DOI:
- 10.1051/0004-6361/202243538
- arXiv:
- arXiv:2203.07398
- Bibcode:
- 2022A&A...665A.100L
- Keywords:
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- galaxies: clusters: general;
- cosmology: observations;
- large-scale structure of Universe;
- surveys;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 8 pages, 5 figures, 1 table. Submitted to A&