Measuring subhalo mass in redMaPPer clusters with CFHT Stripe 82 Survey

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