Publication Date:
2016-03-24
Description:
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 $M_{\rm sub}/M_{\rm star}=4.43^{+ 6.63}_{- 2.23}$ at r p [0.1, 0.3] h –1 Mpc to $M_{\rm sub}/M_{\rm star}=75.40^{+ 19.73}_{- 19.09}$ 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: $\log (M_{\rm sub}/{h^{-1}\,\mathrm{M}_{{\odot }}})=11.14 ^{+ 0.66 }_{- 0.73}$ ( $M_{\rm sub}/M_{\rm star}=19.5^{+19.8}_{-17.9}$ ) versus $\log (M_{\rm sub}/{h^{-1}\,\mathrm{M}_{{\odot }}})=12.38 ^{+ 0.16 }_{- 0.16}$ ( $M_{\rm sub}/M_{\rm star}=21.1^{+7.4}_{-7.7}$ ).
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
Permalink