The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses★

Abstract

Masses of clusters of galaxies from weak gravitational lensing analyses of\never larger samples are increasingly used as the reference to which baryonic\nscaling relations are compared. In this paper we revisit the analysis of a\nsample of 50 clusters studied as part of the Canadian Cluster Comparison\nProject. We examine the key sources of systematic error in cluster masses. We\nquantify the robustness of our shape measurements and calibrate our algorithm\nempirically using extensive image simulations. The source redshift distribution\nis revised using the latest state-of-the-art photometric redshift catalogs that\ninclude new deep near-infrared observations. Nonetheless we find that the\nuncertainty in the determination of photometric redshifts is the largest source\nof systematic error for our mass estimates. We use our updated masses to\ndetermine b, the bias in the hydrostatic mass, for the clusters detected by\nPlanck. Our results suggest 1-b=0.76+-0.05(stat)}+-0.06(syst)}, which does not\nresolve the tension with the measurements from the primary cosmic microwave\nbackground.\n