| Detailed Cluster Mass and Light profiles of A1703, A370 and RXJ1347-11 from Deep Subaru Imaging (2009) | |||||||||
Abstract | |||||||||
| We carefully examine the luminous content of three high mass clusters, A1703 (z=0.258), A370 (z=0.375) and RXJ1347-11 (z=0.45), with deep Subaru imaging. Accurate three-colour data allows us to separate well the populations of cluster members, foreground galaxies and the red and blue background galaxies. The clusters are well defined in colour-colour space by virtue of their smaller projected distance from the cluster centre compared to the unclustered background and foreground. Correction for residual background contamination of the cluster member population is obtained in colour-colour space with reference to the unbiased weak lensing of background galaxies. The derived cluster luminosity functions have similar faint-end slopes, \alpha ~ -1.0, with no marked faint-end upturn to M_R ~ -15.0, and only a mild radial trend. The light profiles of the clusters all decline smoothly as ~ 1/r in projection, whereas the mass profiles are well described by the continuously varying NFW profile, so that the M/L profile peaks around ~ 0.2 r_{vir}, in the range 300-500(M/L_R)_\odot, and then steadily fall to ~ 100(M/L_R)_{\odot} at the virial radius of each cluster, similar to the mean field level. The radial trend of M/L is consistent with dynamical work, establishing this behavior as a universal property of high mass clusters. This is not accounted for by the mild colour trend, but is likely due to a deficit of later-type galaxies near cluster centres, in contrast with red-sequence galaxies that show a much flatter M/L profile. It may indicate that galaxy disks are more susceptible to stripping processes during merger events with implications for the morphological evolution of disk galaxies falling into clusters.. Comment: 17 pages, 13 figures, submitted to MNRAS; corrected typo | |||||||||
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