Measuring subhalo mass in redMaPPer clusters with CFHT Stripe 82 Survey

We use the shear catalogue from the CFHT Stripe-82 Survey to measure the subhalo masses of satellite galaxies in redMaPPer clusters. Assuming a Chabrier initial mass function and a truncated NFW model for the subhalo mass distribution, we find that the subhalo mass to galaxy stellar mass ratio increases as a function of projected halo-centric radius r_p, from M_sub/M_star=4.43^{+ 6.63}_{- 2.23} at r_p ∈ [0.1, 0.3] h^-1 Mpc to M_sub/M_star=75.40^{+ 19.73}_{- 19.09} at r_p ∈ [0.6, 0.9] h^-1 Mpc. We also investigate the dependence of subhalo masses on stellar mass by splitting satellite galaxies into two stellar mass bins: 10 < log (M_star/h^-1 M_⊙) < 10.5 and 11 < log (M_star/h^-1 M_⊙) < 12. The best-fitting subhalo mass of the more massive satellite galaxy bin is larger than that of the less massive satellites: log (M_sub/{h^{-1} M_{{⊙}}})=11.14 ^{+ 0.66 }_{- 0.73} (M_sub/M_star=19.5^{+19.8}_{-17.9}) versus log (M_sub/{h^{-1} M_{{⊙}}})=12.38 ^{+ 0.16 }_{- 0.16} (M_sub/M_star=21.1^{+7.4}_{-7.7}).