Sunyaev–Zel’dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters

• Main Authors: Dietrich, J.P., Bocquet, S., Schrabback, T., Applegate, D., Hoekstra, H., Grandis, S., Mohr, J.J., Allen, S.W., Bayliss, Matthew B, Benson, B.A., Bleem, L.E., Brodwin, M., Bulbul, Esra, 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, Michael A., Raghunathan, S., Rapetti, D., Reichardt, C.L., Saro, A., Stalder, B., Stark, A., Stern, C., Stubbs, C.
• Other Authors: MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology. Department of Physics
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2020
• Subjects: Navarro; New Ground; South Pole; South pole
• Online Access: https://hdl.handle.net/1721.1/132338.2

© 2018 The Author(s). Uncertainty in mass-observable scaling relations is currently the limiting factor for galaxycluster-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 Mgas and YX, the product of Mgas 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.