The connection between the escape of ionizing photons and galaxy properties at z~3

Anthony Pahl, UCLA
Tuesday, October 11, 2022
4:00 pm
RH 192
The connection between the escape fraction of ionizing photons (f_esc) and the properties of galaxies, such as stellar mass, age, star-formation rate (SFR) surface density, and dust content, are key inputs for reionization models, but many of these relationships remain untested at high redshift. In this talk, I present an analysis of a sample of ~100 z~3 galaxies from the Keck Lyman Continuum Spectroscopic Survey. These galaxies have both sensitive Keck/LRIS spectroscopic measurements of the Lyman continuum region and multi-band photometry, placing constraints on stellar population parameters. Of particular interest is a subsample of 35 galaxies with high-resolution HST imaging, enabling estimates of rest-UV sizes, and thus, SFR surface density. I will present f_esc measurements of the full sample binned as a function of M*, SFR, age, and E(B-V), alongside our exploration of the relationship between f_esc and SFR surface density at z~3. This is the most comprehensive analysis of galaxy properties and LyC escape to date, and will be used to guide future models and observations of the reionization epoch. 
Paul Robertson