0 Assigned ID: 2214 ----- Attempting Submission 1 (Tue Oct 29 12:05:07 GMT 2013) ----- Joint Spizter/HST Award 0 ----- Attempting Submission 1 (Mon Dec 09 14:03:05 GMT 2013) ----- We propose to study the stellar populations in a sample of strong gravitationally lensed starburst galaxies discovered by the South Pole Telescope (SPT) in a 2500 square degree survey of the southern sky. In the first extragalactic spectroscopic redshift survey with ALMA, we have obtained robust and unambiguous redshifts for these sources directly from their star forming gas, as traced by carbon monoxide. High-resolution ALMA imaging conclusively demonstrates that these sources are strong gravitationally lensed by foreground galaxies and allows us to make state-of-the-art lens models with a custom pipeline. The central aim of this proposal is to use Spitzer/IRAC to determine stellar masses for 14 of these sources to connect the rapid star formation observed with ALMA to the generations of stars that came before them. The combination of our unique ALMA dataset with the proposed Spitzer observations will allow a full characterization of the stars, gas, and dust in this cosmologically important class of primordial starburst galaxies which mark the epoch of stellar mass assembly in the Universe. We ask for 37 hours of Spitzer/IRAC and 6 orbits of HST/ACS+WFC3 to observe 14 high redshift starburst galaxies spanning 2.5<z<5.7. We are observing 6 targets for 1 orbit each with WFC3 F140W. We will implement the dither patterm WFC3-IR-DITHER-BOX-MIN optimised for maximum resolution. The SPARS50 sample sequence will be applied for the multiaccum mode. Default false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 43.8 mJy GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 38.2 mJy GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 36.5mJy GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 26.2mJy GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 25.6mJy GALAXY HIGH REDSHIFT GALAXY STARBURST ULTRALUMINOUS IR GAL J2000 S_1.4mm = 35.38mJy WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W 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 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false 1385940165854 /Users/jingzhema/Documents/Proposals/PI/HST Cycle21 Phase II/OP-cache/HST_PhaseII_13614-v01.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 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