The nature and environment of the most luminous starburst galaxies at redshift

0 Assigned ID: 428 ----- Attempting Submission 1 (Fri Apr 10 11:07:06 GMT 2015) ----- HST Phase I Proposal 428 (hermeshighz_ipf_tests_v2.apt) successfully submitted. Receipt: # 428-1 ----- Attempting Submission 2 (Fri Apr 10 11:14:12 GMT 2015) ----- HST Phase I Proposal 428 (cycle23.apt) successfully submitted. Receipt: # 428-2 ----- Attempting Submission 3 (Fri Apr 10 18:52:55 GMT 2015) ----- HST Phase I Proposal 428 (cycle23.apt) successfully submitted. Receipt: # 428-3 ----- Attempting Submission 4 (Fri Apr 10 20:12:30 GMT 2015) ----- HST Phase I Proposal 428 (cycle23.apt) successfully submitted. Receipt: # 428-4 ----- Attempting Submission 5 (Fri Apr 10 23:30:02 GMT 2015) ----- HST Phase I Proposal 428 (cyc23_submitted_at_21local.apt) successfully submitted. Receipt: # 428-5 ----- Attempting Submission 6 (Fri Apr 10 23:49:16 GMT 2015) ----- 0 ----- Attempting Submission 1 (Wed Jul 08 19:53:02 GMT 2015) ----- HST Phase II Proposal 14083 (14083_phase1.apt) successfully submitted. Receipt: # 14083-1 ----- Attempting Submission 2 (Thu Jul 23 16:11:43 GMT 2015) ----- The nature and environment of the most luminous starburst galaxies at redshift > 5 We propose HST WFC3 imaging of the brightest three recently discovered, dusty star forming galaxies at z > 5, selected from the Herschel HerMES survey and with CO redshifts measured with ALMA in a cycle 2 program. Theoretically, the existence of dusty, massive startbursts at such early epochs is difficult to explain and thorough observational constraints on their properties provides a stringent test of galaxy formation models. Our targets have a multitude of far-infrared follow-up data, including SMA and NOEMA observations and the CO spectroscopy in the 3mm ALMA band that revealed their extreme redshifts. However, the currently available ground-based, near-IR observations are shallow and lack the resolution and sensitivity of HST at these wavelengths, which is needed to completely reveal these rare galaxies, and to measure any gravitational lensing amplification. We will use the proposed data to measure the physical properties of these three z > 5 dusty starbursts, including their sizes, stellar masses, and the scale and intensity of the star formation. There is also evidence of gravitational lensing and the HST data are crucial for accurately measuring the lensing amplification and reconstructing the source plane. The wider field data will be used to investigate the environments of these galaxies and determine whether they are protocluster members, as often expected of massive high-redshift galaxies and similarly to some other z ~ 4 - 5 starbursts. We will be able to measure the dark matter halo mass scale and thereby consider the evolution and descendent of these galaxies, particularly in comparison with lower redshift dusty starbursts. We require WFC3 observations with the F105W and F160W filters of three dusty z>5 target galaxies. For all three targets WFC3 observations in each filter will be completed in a single orbit. (Total = 6 WFC3 orbits) For the WFC3 observations we calculate predicted F105W and F160W fluxes of our targets by scaling the SED of Arp220 to the observed farinfrared fluxes, fixed to the CO redshifts. As described in the proposal, there is some exvidence of the targets being marginally resolved in existing low SNR data, and therefore the required WFC3 exposure times are ~4x those calculated from the fluxes alone, and ~4x those in each of the ETC references. There are no constraints on observing date or orientation. COSMOLOGY 12 false false false false SUPPORTED GALAXY ULTRALUMINOUS IR GAL J2000 J2000 GALAXY ULTRALUMINOUS IR GAL J2000 J2000 GALAXY ULTRALUMINOUS IR GAL J2000 J2000 WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1

false

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