FINAL re-submission of Windhorst et al. HST Cycle 24 AR proposal with as title: Project ALCATRAZ: Archival Lyman-Continuum and Theoretical Reionization Analysis vs. z: Where, When, & How Much Does LyC Escape from Galaxies & AGN? Please confirm its receipt. Thanks! -2121241836 Assigned ID: 49 ----- Attempting Submission 1 (Fri Apr 01 11:54:39 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-1 ----- Attempting Submission 2 (Sat Apr 02 10:25:10 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-2 ----- Attempting Submission 3 (Sun Apr 03 12:33:48 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-3 ----- Attempting Submission 4 (Mon Apr 04 05:06:18 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-4 ----- Attempting Submission 5 (Tue Apr 05 13:38:47 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-5 ----- Attempting Submission 6 (Wed Apr 06 11:41:46 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-6 ----- Attempting Submission 7 (Thu Apr 07 11:38:59 GMT 2016) ----- HST Phase I Proposal 49 (hstcy24uvescv1.apt) successfully submitted. Receipt: # 49-7 ----- Attempting Submission 8 (Fri Apr 08 23:47:33 GMT 2016) ----- Project ALCATRAZ will study Lyman continuum (LyC) radiation escaping from galaxies and weak AGN at z=2.3-4, vastly expanding our systematic study of the Early Release Science (ERS) field to include Archival UV images in HUDF and GOODS/CANDELS. Each field was imaged in 2-3 WFC3 UV-filters and 6-9 ACS + WFC3/IR filters. SED-fits for objects with secure spectroscopic redshifts will provide luminosity, stellar mass, age, SFR, extinction, and escape fraction estimates. With very careful attention to systematics, stacking 6-15 orbit native depth for many 100s of objects will reach UV-depths of 100s-1000s of orbits. ALCATRAZ will reveal where, when, how, and how much LyC escapes, and if galaxies started and AGN maintained cosmic reionization. Its science goals are: 1. HOW MUCH LyC escapes? First results from separately stacking 50 galaxies and 14 weak AGN at z=2.3-4 suggest m(LyC) ~ 29-30.5 mag (>3-4 sigma). With robust 8-12 filter SEDs, HST rejection of foreground interlopers, and 115 new ground-based spectra, ALCATRAZ will increase current statistics 7x and depth 2.7x. 2. WHERE and HOW does LyC escape? HST stacking will measure LyC light-profiles at radii r<0.7", which are likely shallow if LyC escapes through an ISM that gets more porous at larger radii, which we will constrain. 3. WHEN did LyC escape? We will constrain how LyC escape fractions evolved with epoch for galaxies & weak AGN, and if this followed the cosmic star-formation rate. 4. WHY do escape fractions evolve so strongly with epoch? We will study for LBGs, Lya-galaxies, dusty star-forming galaxies, and weak AGN with outflows how dust and gas accumulating over time may have suppressed the escaping LyC. Galaxies Massive Black Holes and their Hosts 0 Regular false true false SUPPORTED