0 Assigned ID: 627 ----- Attempting Submission 1 (Fri Apr 10 18:05:06 GMT 2015) ----- 0 ----- Attempting Submission 1 (Fri Jul 17 21:51:23 GMT 2015) ----- We propose to obtain ACS/F814W and WFC3/F140W imaging of a complete sample of the five highest redshift clusters discovered in the SPT-SZ survey. This will enable a first uniform statistical study of galaxy populations in the most massive structures at z>1.4. This redshift is a crucial transition time for massive galaxies in cluster environments. It bridges the major star formation events at z~2 that built most of the stars in massive cluster early-types, and the z~1 regime largely characterized by passive evolution in cluster cores. Massive clusters at this time are still very rare. Cluster galaxies at this redshift have thus been investigated in only a handful of clusters selected in different ways that may well bias galaxy population studies. As an important next step beyond these initial studies, this project explores central questions that still remain controversial: How efficient is quenching of star formation in the most massive structures at z~1.5? How common are highly star-forming galaxies in the densest cluster-core environments? What are the morphologies of massive cluster galaxies, and how different is their structural evolution in clusters and in the field? How is the link between old stellar populations and bulge-dominated structure established so early? Answering these questions requires deep high-resolution observations to probe stellar populations and morphologies, and a statistically significant, unbiased, uniform sample of cluster galaxies in very massive structures, where environmental signatures are expected to be more evident. The combination of HST capabilities with a unique cluster sample now allows a first, timely and necessary step forward. This is a standard WFC3/IR and ACS/WFC deep imaging program of 5 SPT-selected galaxy clusters at z>1.4: SPT-CLJ2040-4451, SPT-CLJ0607-4448, SPT-CLJ0459-4947, SPT-CLJ0421-4845, SPT-CLJ0446-4606. All clusters are imaged with ACS/F814W for 2 orbits each (on source exposure time ~4700-4800s). SPT-CLJ0607-4448, SPT-CLJ0459-4947, SPT-CLJ0421-4845, SPT-CLJ0446-4606 are also imaged with WFC3/F140W for 1 orbit each (on source time ~ 2424s). WFC3/F140W observations of each cluster are acquired with 8 dithered exposures (on a dither-blob + dither-box-min pattern). ACS/F814W observations are acquired with 8 dithered exposures (on a dither-line + dither-box pattern). For all observations, sufficient dithering is required not only for artifact and cosmic ray removal but also for appropriate PSF reconstruction, in view of the morphological analysis to be carried out on these data. The adopted dithering for ACS observations also fills the gap between the two WFC detectors. COSMOLOGY 12 false false false false SUPPORTED CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Target cluster galaxies have F814W<25.8, F140W<23.3 AB mag. Brightest source around (within ~4' box) has J~15.4, r~13.5 mag (Vega). CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Target cluster galaxies have F814W<25.8, F140W<23.3 AB mag. Brightest source around (within ~4' box) has J~13.3, r~12.2 mag (Vega). CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Target cluster galaxies have F814W<25.8, F140W<23.3 AB mag.Brightest source around (within ~4' box) has J~15.5, r~14.5 mag (Vega). CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Target cluster galaxies have F814W<25.8, F140W<23.3 AB mag.Brightest source around (within ~4' box) has J~14.6, r~13.3 mag (Vega). CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Target cluster galaxies have F814W<25.8, F140W<23.3 AB mag.Brightest source around (within ~4' box) has J~15.4, r~14.4 mag (Vega). ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 true 0.365 0.572 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 4 true POS-TARG DITHER DITHER 4 3.011 ACS-WFC-DITHER-BOX false 69.05 false 0.187 0.265 2 85.28 POS-TARG ACS-WFC-DITHER-LINE 20.67 5 true 1437169525215 /tmp/OPVisit3362523121443629780.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 2-orbit ACS/F814 observations of SPT-CLJ2040-4451 (4752s on source). 8 dithers. 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