Abstract

The epoch of reionization (EoR) is the last major phase change experienced by the IGM, yet little is known about the exact timeline of reionization and the dominant ionizing sources that drove it. Direct measurement of the neutral hydrogen fraction at the epoch of reionization using the Lyman-alpha emission line is a promising way to answer these unknowns. However, internal processes within a galaxy such as kinematics and dust contents alter the amount of emerged Lyma-alpha that ultimately escapes from a galaxy. Making determinations of the emergent Lyman-alpha strength of a galaxy using techniques like star formation rates are inaccurate. Thus, a more accurate way to compute the emergent Lyman-alpha strength, post ISM but pre-CGM,  is needed to compare against the observed strength of Lyman-alpha to measure the neutral fraction at a given epoch. To decouple the IGM attenuation on Lyman-alpha emission we look to study Lyman-alpha emitters (LAEs) at z ~ 2-3.5 using the Texas Euclid Search for Lyman-alpha (TESLA) Survey. TESLA will aim to uncover ~ 50,000 LAEs and generate a predictive distribution of emergent Lyman-alpha strength that is tied to SED-derived galaxy properties. We show the results of a pilot study focusing on the Euclid North Ecliptic Pole (NEP) field. This pilot study outlines the methodology to find LAEs in the NEP field, acquire SED-derived properties with BAGPIPES, and explore correlations with Lyman-alpha equivalent width and global galaxy properties on 43 LAEs. We show results of possible correlations between the Lyman-alpha EW and stellar mass, and Lyman-alpha EW and SFR at the one sigma value. By expanding this analysis to a bigger sample size we will be able to robustly measure correlations between Lyman-alpha equivalent width and galaxy properties like never before. The increased sample size of future projects will inform us when generating the predictive distribution of emergent Lyman alpha strength as it relates to galaxy properties.