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We present a five-band Herschel study (100-500um) of three galaxy clusters atz~1.2 from the Spitzer Adaptation of the Red-Sequence Cluster Survey (SpARCS).With a sample of 120 spectroscopically-confirmed cluster members, weinvestigate the role of environment on galaxy properties utilizing theprojected cluster phase space (line-of-sight velocity versus clustercentricradius), which probes the time-averaged galaxy density to which a galaxy hasbeen exposed. We divide cluster galaxies into phase-space bins of (r/r200) x(v/sigma_v), tracing a sequence of accretion histories in phase space. Stackingoptically star-forming cluster members on the Herschel maps, we measure averageinfrared star formation rates, and, for the first time in high-redshift galaxyclusters, dust temperatures for dynamically distinct galaxypopulations---namely, recent infalls and those that were accreted onto thecluster at an earlier epoch. Proceeding from the infalling to virialized(central) regions of phase space, we find a steady decrease in the specificstar formation rate and increase in the stellar age of star-forming clustergalaxies. We perform a probability analysis to investigate all acceptableinfrared spectral energy distributions within the full parameter space andmeasure a ~4 sigma drop in the average dust temperature of cluster galaxies inan intermediate phase-space bin, compared to an otherwise flat trend with phasespace. We suggest one plausible quenching mechanism which may be consistentwith these trends, invoking ram-pressure stripping of the warmer dust forgalaxies within this intermediate accretion phase.

The Phase Space of z~1.2 SpARCS Clusters: Using Herschel to probe Dust Temperature as a Function of Environment and Accretion History