Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 483, Issue 3, Pages 2871-2906Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty3088
Keywords
gravitational lensing: weak; galaxies: clusters: general; cosmology: observations
Categories
Funding
- DFG Cluster of Excellence 'Origin and Structure of the Universe'
- DFG program 'The Dark Universe' [Transregio TR33]
- National Science Foundation [PLR-1248097]
- NSF Physics Frontier Center grant [PHY-1125897]
- Kavli Foundation
- Gordon and Betty Moore Foundation [GBMF 947]
- German Federal Ministry of Economics and Technology (BMWi) through DLR [50 OR 1210, 50 OR 1308, 50 OR 1407, 50 OR 1610]
- NASA Postdoctoral Program Senior Fellowship at NASA's Ames Research Center
- NASA
- Australian Research Council's Discovery Projects funding scheme [DP150103208]
- ERC-StG 'ClustersXCosmo' [71676]
- ESO Telescopes at the La Silla Paranal Observatory under ESO programme [179.A-2005]
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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.
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