AMICO galaxy clusters in KiDS-DR3: Cosmological constraints from counts and stacked weak lensing^⋆

¹ Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna, Via Piero Gobetti 93/2, 40129 Bologna, Italy
e-mail: giorgio.lesci@studio.unibo.it
² INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy
³ INFN – Sezione di Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
⁴ Dipartimento di Fisica, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
⁵ Zentrum für Astronomie, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany
⁶ ITP, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
⁷ INAF – Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, 35122 Padova, Italy
⁸ INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
⁹ Dip. di Fisica “E. Pancini”, Università di Napoli Federico II, C.U. di Monte Sant’Angelo, Via Cintia, 80126 Napoli, Italy
¹⁰ INFN, Sez. di Napoli, Via Cintia, 80126 Napoli, Italy
¹¹ Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK

Received: 21 December 2020
Accepted: 20 December 2021

Abstract

Aims. We present a cosmological analysis of abundances and stacked weak lensing profiles of galaxy clusters, exploiting the AMICO KiDS-DR3 catalogue. The sample consists of 3652 galaxy clusters with intrinsic richness λ^* ≥ 20, over an effective area of 377 deg², in the redshift range z ∈ [0.1,  0.6].

Methods. We quantified the purity and completeness of the sample through simulations. The statistical analysis has been performed by simultaneously modelling the co-moving number density of galaxy clusters and the scaling relation between the intrinsic richnesses and the cluster masses, assessed through stacked weak lensing profile modelling. The fluctuations of the matter background density, caused by super-survey modes, have been taken into account in the likelihood. Assuming a flat Λ cold dark matter (ΛCDM) model, we constrained Ω_m, σ₈, S₈ ≡ σ₈(Ω_m/0.3)^0.5, and the parameters of the mass-richness scaling relation.

Results. We obtained Ω_m = 0.24_−0.04^+0.03, σ₈ = 0.86_−0.07^+0.07, and S₈ = 0.78_−0.04^+0.04. The constraint on S₈ is consistent within 1σ with the results from WMAP and Planck. Furthermore, we got constraints on the cluster mass scaling relation in agreement with those obtained from a previous weak lensing only analysis.