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The correlation between 21cm fluctuations and galaxies is sensitive to theastrophysical properties of the galaxies that drove reionization. Thus,detailed measurements of the cross-power spectrum and its evolution couldprovide a powerful measurement both of the properties of early galaxies and theprocess of reionization. In this paper, we study the evolution of thecross-power spectrum between 21cm emission and galaxies using a model whichcombines the hierarchical galaxy formation model GALFORM implemented within theMillennium-II dark matter simulation, with a semi-numerical scheme to describethe resulting ionization structure. We find that inclusion of differentfeedback processes changes the cross-power spectrum shape and amplitude. Inparticular, the feature in the cross-power spectrum corresponding to the sizeof ionized regions is significantly affected by supernovae feedback. Wecalculate predicted observational uncertainties of the cross-correlationcoefficient based on specifications of the Murchison Widefield Array (MWA)combined with galaxy surveys of varying area and depth. We find that thecross-power spectrum could be detected over several square degrees of galaxysurvey with galaxy redshift errors less than 0.1.

The cross-power spectrum between 21cm emission and galaxies in hierarchical galaxy formation models