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We investigate the impact of sinks of ionizing radiation on thereionization-era 21-cm signal, focusing on 1-point statistics. We considersinks in both the intergalactic medium and inside galaxies. At a fixed fillingfactor of HII regions, sinks will have two main effects on the 21-cmmorphology: (i) as inhomogeneous absorbers of ionizing photons they result insmaller and more widespread cosmic HII patches; and (ii) as reservoirs ofneutral gas they contribute a non-zero 21-cm signal in otherwise ionizedregions. Both effects damp the contrast between neutral and ionized patchesduring reionization, making detection of the epoch of reionization with 21-cminterferometry more challenging. Here we systematically investigate theseeffects using the latest semi-numerical simulations. We find that sinksdramatically suppress the peak in the redshift evolution of the variance,corresponding to the midpoint of reionization. As previously predicted,skewness changes sign at midpoint, but the fluctuations in the residual HIsuppress a late-time rise. Furthermore, large levels of residual HIdramatically alter the evolution of the variance, skewness and power spectrumfrom that seen at lower levels. In general, the evolution of the large-scalemodes provides a better, cleaner, higher signal-to-noise probe of reionization.

21-cm signatures of residual HI inside cosmic HII regions during reionization