Assigned ID: 72 ----- Attempting Submission 1 (Tue Feb 21 21:10:06 GMT 2012) ----- HST Phase I Proposal 72 (APT_lyc_archive_cs2.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 24 02:54:44 GMT 2012) ----- HST Phase I Proposal 72 (APT_lyc_archive_cs2.apt) successfully submitted. ----- Attempting Submission 3 (Fri Feb 24 19:52:36 GMT 2012) ----- HST Phase I Proposal 72 (APT_lyc_archive_cs2.apt) successfully submitted. ----- Attempting Submission 4 (Fri Feb 24 23:33:42 GMT 2012) ----- HST Phase I Proposal 72 (APT_lyc_archive_cs2.apt) successfully submitted. ----- Attempting Submission 5 (Fri Feb 24 23:55:35 GMT 2012) ----- Evidence increasingly indicates that star-forming galaxies reionized the universe at redshifts between 12 and 6, but at the current juncture our empirical understanding of the ionizing output of galaxies is unsatisfactory. Measurements and constraints on the ionizing output of galaxies are available between redshifts 0 and 3 (where the effect of the intervening IGM is minimum) for bright/massive galaxies, but almost non-existent for sub-M* objects. This is a major observational deficiency, since most theoretical studies predict a high(er) escape fraction of ionizing radiation in galaxies at the low mass end. Here we propose to combine the power of WFC3 IR grism spectroscopy with deep GALEX UV imaging to measure Lyman Continuum (LyC) leakage from galaxies at 0.95<z<1.5. The analysis will be performed in the CANDELS fields which are covered with the deepest data ever obtained with the GALEX satellite. We will identify a line flux-limited sample of ~ 3000 Halpha (Ha) emitters for which we will measure the absolute escape fraction of LyC photons. Most importantly, this sample will include ~700 sub-M* strong Ha emitters, that are thought to be the analogs of the sources that reionized the universe. COSMOLOGY 12 Medium false 0.0 0.0 false false false false SUPPORTED