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Reionization is thought to have occurred in the redshift range of 6 z 9, which is now being probed by both deep galaxy surveys and CMB observations. halo abundance matching over the redshift range 56 that matches the measured luminosity functions at these redshifts. We find that f\ peaks \ 30\\% at halo masses M \ 10^11--10^12~M_\, in agreement with its behavior at lower redshifts. We then investigate cosmic star formation histories and the corresponding models of for a range of extrapolations to small halo masses. We use a of observations to further constrain the characteristics of the galaxy, including the escape fraction of UV photons. Our approach provides empirically-calibrated, physically-motivated model for the properties of-forming galaxies sourcing the epoch of reionization. In the case where formation in low-mass halos is maximally efficient, an average escape \0. 1 can reproduce the optical depth reported by Planck, whereas star formation in these halos requires either about twice as many photons to escape, or an escape fraction that increases towards higher. Our models also predict how future observations with JWST can our understanding of these galaxy populations.
Sun et al. (Tue,) studied this question.