Speaker:
Anthony Pahl, UCLA
Date:
Tuesday, October 11, 2022
Time:
4:00 pm
Location:
RH 192
Abstract:
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.
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.
Host:
Paul Robertson