Monday.
1502.01883
The Canadian Cluster Comparison Project: detailed study of systematic and updated weak lensing masses
Hoekstra, Herbonnet, Muzzin, Babul, Mahdavi, Viola, Cacciato
Masses of clusters of galaxies from WL analyses of ever larger samples are increasingly used as the reference to which baryonic scaling relations are compared. In this paper, revisit the analysis of a sample of 50 clusters studied as part of the Canadian Cluster comparison Project. Examine the key sources of systematic error in cluster masses. Quantify the robustness of shape measurements and calibrate the algorithm empirically using extensive image simulations. The source redshift distribution is revised using the latest state-of-the-art photometric redshift catalogs that include new deep NIR observations. Nonetheless find that the uncertainty in the determination of photometric redshifts is the largest source of systematic error for the mass estimates. Use updated masses to determine b, the bias in the hydrostatic mass, for the clusters detected by Planck. Results suggest 1-b = 0.76pm0.05(stat)pm0.06(sys), which does not resolve the tension with the measurements from the primary cosmic microwave background.
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