CODEX Weak Lensing: Concentration of Galaxy Clusters at z ~ 0.5

Abstract

We present a stacked weak lensing analysis of 27 richness selected galaxy clusters at $0.40⩽z⩽0.62$ in the CODEX survey. The fields were observed in 5 bands with the CFHT. We measure the stacked surface mass density profile with a $14\sigma$ significance in the radial range $0.1<RMpc{h}^{-1}<2.5$. The profile is well described by the halo model, with the main halo term following an NFW profile and including the off-centring effect. We select the background sample using a conservative colour-magnitude method to reduce the potential systematic errors and contamination by cluster member galaxies. We perform a Bayesian analysis for the stacked profile and constrain the best-fit NFW parameters $M_{200c}=6.6_{-0.8}^{+1.0}\times 10^{14}{h}^{-1}{M}_{\odot }$ and $c_{200c}=3.7_{-0.6}^{+0.7}$. The off-centring effect was modelled based on previous observational results found for redMaPPer SDSS clusters. Our constraints on $M_{200c}$ and $c_{200c}$ allow us to investigate the consistency with numerical predictions and select a concentration-mass relation to describe the high richness CODEX sample. Comparing our best-fit values for $M_{200c}$ and $c_{200c}$ with other observational surveys at different redshifts, we find no evidence for evolution in the concentration-mass relation, though it could be mitigated by particular selection functions. Similar to previous studies investigating the X-ray luminosity-mass relation, our data suggests a lower evolution than expected from self-similarity.

arXiv comment28 pages, 17 figures, submitted to MNRAS

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