Institution(s): 1. University of Texas at Austin
The CANDELS survey has revolutionized the study of galaxies in the epoch of reionization, with the wide field and near-infrared coverage enabling the discovery of candidates for the brightest galaxies in the crucial redshift range 6 < z < 9. I will present results from spectroscopic followup of these candidates with Keck/MOSFIRE and DEIMOS, and will discuss the implications for reionization of the rapid drop-off in detection of Lyman alpha emission between z~6 and z~7.
Complementing the results from CANDELS, the Hubble Frontier Fields open up the faint end of the luminosity function with their combination of deep HST imaging and magnification from gravitational lensing. I will discuss methods of removing the foreground galaxies and intracluster light through modelling and wavelet decomposition. This enables us to detect the faintest high-redshift galaxies in the fields, and provides insight into the faint-end slope of the luminosity function at 6 < z < 9, revealing the galaxies believed to be responsible for the bulk of the energy contributing to reionization in this epoch.