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. Univ. of Colorado, Boulder, CO . Center for Astrophysics and Space Astronomy, Dept. of Astrophysical and Planetary Science; NASA Ames Research Center , Moffett Field, Mountain View, CA, Reichardt, C. L. Univ. of Melbourne, Parkville, VIC . School of Physics, Saro, A. Ludwig-Maximilians-Univ., Munich, Excellence Cluster Universe, Garching, NASA Ames Research Center , Moffett Field, Mountain View, CA, Stalder, B. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA . Large Synoptic Survey Telescope, Stark, A. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, Stern, C. Ludwig-Maximilians-Univ., Munich, Stubbs, C. Harvard Univ., Cambridge, MA . Dept. of Physics
• Language: unknown
• Published: 2022
• Subjects: 79 ASTRONOMY AND ASTROPHYSICS; Navarro; New Ground; South Pole; South pole
• Online Access: http://www.osti.gov/servlets/purl/1413679; https://www.osti.gov/biblio/1413679; https://doi.org/10.1093/mnras/sty3088

Uncertainty in the mass-observable scaling relations is currently the limiting factor for galaxy cluster based cosmology. Weak gravitational lensing can provide a direct mass calibration and reduce the mass uncertainty. We present new ground-based weak lensing observations of 19 South Pole Telescope (SPT) selected clusters and combine them with previously reported space-based observations of 13 galaxy clusters to constrain the cluster mass scaling relations with the Sunyaev-Zel'dovich effect (SZE), the cluster gas mass $M_\mathrm{gas}$, and $Y_\mathrm{X}$, the product of $M_\mathrm{gas}$ 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. Here, 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 6.4% in cluster mass (68% confidence). Our constraints on the mass-X-ray observable scaling relations parameters are consistent with those obtained by earlier studies, and our constraints for the mass-SZE scaling relation are consistent with the 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 on the same clusters.