Sunyaev–Zel'dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters. Issue 3 (20th December 2018)

• Record Type: Journal Article
• Authors: Dietrich, J P; Bocquet, S; Schrabback, T; Applegate, D; Hoekstra, H; Grandis, S; Mohr, J J; Allen, S W; Bayliss, M B; Benson, B A; Bleem, L E; Brodwin, M; Bulbul, E; Capasso, R; Chiu, I; Crawford, T M; Gonzalez, A H; de Haan, T; Klein, M; von der Linden, A; Mantz, A B; Marrone, D P; McDonald, M; Raghunathan, S; Rapetti, D; Reichardt, C L; Saro, A; Stalder, B; Stark, A; Stern, C; Stubbs, C;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 483:Issue 3(2019)
• Page Start: 2871
• Page End: 2906
• Publication Date: 2018-12-20
• Subjects: gravitational lensing: weak -- galaxies: clusters: general -- cosmology: observations; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty3088
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: Uncertainty in mass–observable scaling relations is currently the limiting factor for galaxy-cluster-based cosmology. Weak gravitational lensing can provide direct mass calibration and reduce the mass uncertainty. We present new ground-based weak lensing observations of 19 South Pole Telescope (SPT) selected clusters at redshifts 0.29 ≤ $z$ ≤ 0.61 and combine them with previously reported space-based observations of 13 galaxy clusters at redshifts 0.576 ≤ $z$ ≤ 1.132 to constrain the cluster mass scaling relations with the Sunyaev–Zel'dovich effect (SZE), the cluster gas mass M gas and Y X, the product of M gas and X-ray temperature. We extend a previously used framework for the analysis of scaling relations and cosmological constraints obtained from SPT-selected clusters to make use of weak lensing information. We introduce a new approach to estimate the effective average redshift distribution of background galaxies and quantify a number of systematic errors affecting the weak lensing modelling. These errors include a calibration of the bias incurred by fitting a Navarro–Frenk–White profile to the reduced shear using N -body simulations. We blind the analysis to avoid confirmation bias. We are able to limit the systematic uncertainties to 5.6% in cluster mass (68% confidence). Our constraints on the mass–X-ray observable scaling relation parameters are consistent with those obtained by earlier studies and our constraints for the mass–SZE scaling relation are consistent with the simulation-based prior used in the most recent SPT–SZ cosmology analysis. We can now replace the external mass calibration priors used in previous SPT–SZ cosmology studies with a direct, internal calibration obtained for the same clusters.