We study the galaxy populations in 74 Sunyaev Zeldovich Effect ( SZE ) selected clusters from the South Pole Telescope ( SPT ) survey that have been imaged in the science verification phase of the Dark Energy Survey ( DES ) .
The sample extends up to z \sim 1.1 with 4 \times 10 ^ { 14 } M _ { \odot } \leq M _ { 200 } \leq 3 \times 10 ^ { 15 } M _ { \odot } .
Using the band containing the 4000 Å break and its redward neighbor , we study the color-magnitude distributions of cluster galaxies to \sim m _ { * } +2 , finding : ( 1 ) the intrinsic rest frame g - r color width of the red sequence ( RS ) population is \sim 0.03 out to z \sim 0.85 with a preference for an increase to \sim 0.07 at z = 1 and ( 2 ) the prominence of the RS declines beyond z \sim 0.6 .
The spatial distribution of cluster galaxies is well described by the NFW profile out to 4 R _ { 200 } with a concentration of c _ { \mathrm { g } } = 3.59 ^ { +0.20 } _ { -0.18 } , 5.37 ^ { +0.27 } _ { -0.24 } and 1.38 ^ { +0.21 } _ { -0.19 } for the full , the RS and the blue non-RS populations , respectively , but with \sim 40 % to 55 % cluster to cluster variation and no statistically significant redshift or mass trends .
The number of galaxies within the virial region N _ { 200 } exhibits a mass trend indicating that the number of galaxies per unit total mass is lower in the most massive clusters , and shows no significant redshift trend .
The red sequence ( RS ) fraction within R _ { 200 } is ( 68 \pm 3 ) % at z = 0.46 , varies from \sim 55 % at z = 1 to \sim 80 % at z = 0.1 , and exhibits intrinsic variation among clusters of \sim 14 % .
We discuss a model that suggests the observed redshift trend in RS fraction favors a transformation timescale for infalling field galaxies to become RS galaxies of 2 to 3 Gyr .