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

Understand

We present a stacked weak lensing analysis of 27 richness selected galaxy clusters at $0.40 \leqslant z \leqslant 0.62$ 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 $0.1 < R\ Mpc\ h^{-1} < 2.5$.
• The profile is well described by the halo model, with the main halo term following an NFW profile and including the off-centring effect.