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We explore the connection between the stellar component of galaxies and theirhost halos during the epoch of reionization ($5 \leq z\leq10$) using the CROC(Cosmic Reionization on Computers) simulations. We compare simulated galaxieswith observations and find that CROC underpredicts the abundance of luminousgalaxies when compared to observed UV luminosity functions, and analogously themost massive galaxies when compared to observed stellar mass functions. We cantrace the deficit of star formation to high redshifts, where the slope of thestar formation rate to stellar mass relation is consistent with observations,but the normalization is systematically low. This results in a star formationrate density and stellar mass density that is systematically offset fromobservations. However, the less luminous or lower stellar mass objects haveluminosities and stellar masses that agree fairly well with observational data.We explore the stellar-to-halo mass ratio, a key quantity that is difficult tomeasure at high redshifts and that models do not consistently predict. In CROC,the stellar-to-halo mass ratio {\it decreases} with redshift, a trend oppositeto some abundance matching studies. These discrepancies uncover where futureeffort should be focused in order to improve the fidelity of modeling cosmicreionization. We also compare the CROC galaxy bias with observationalmeasurements using Lyman-Break Galaxy (LBG) samples. The good agreement ofsimulation and data shows that the clustering of dark matter halos is properlycaptured in CROC.

Cosmic Reionization On Computers: The Galaxy-Halo Connection between $5 \leq z \leq10$