Cluster magnification and the mass-richness relation in CFHTLenS

Gravitational lensing magnification is measured with a significance of 9.7 Sigma on a large sample of galaxy clusters in the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS). This survey covers similar to 154 deg(2) and contains over 18 000 cluster candidates at redshifts 0.2 < z < 0.9, detected using the 3D-Matched Filter cluster-finder of Milkeraitis et al. We fit composite-NFW models to the ensemble, accounting for cluster miscentring, source-lens redshift overlap, as well as nearby structure (the two-halo term), and recover mass estimates of the cluster dark matter haloes in range of similar to 10(13) M-circle dot to 2 x 10(14) M-circle dot. Cluster richness is measured for the entire sample, and we bin the clusters according to both richness and redshift. A mass-richness relation M-200 = M-0(N-200/20)(beta) is fit to the measurements. For two different cluster miscentring models, we find consistent results for the normalization and slope, M-0 = (2.3 +/- 0.2) x 10(13) M-circle dot, beta = 1.4 +/- 0.1 and M-0 = (2.2 +/- 0.2) x 10(13) M-circle dot, beta = 1.5 +/- 0.1. We find that accounting for the full redshift distribution of lenses and sources is important, since any overlap can have an impact on mass estimates inferred from flux magnification.