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

• Published in: Monthly Notices of the Royal Astronomical Society
• Main 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.
• Other Authors: von der, Linden, A., Mantz, A., B., Mcdonald, M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2019
• Subjects: gravitational lensing: weak; galaxies: clusters: general; cosmology: observation; Astrophysics - Cosmology and Nongalactic Astrophysics; Navarro; New Ground; South Pole; South pole
• Online Access: http://hdl.handle.net/11368/2962489; https://doi.org/10.1093/mnras/sty3088; https://academic.oup.com/mnras/article/483/3/2871/5255269

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 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.