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We use the Dark-ages, Reionization And Galaxy-formation Observables fromNumerical Simulations (DRAGONS) framework to investigate the effect ofgalaxy-formation physics on the morphology and statistics of ionized hydrogen(HII) regions during the Epoch of Reioinization (EoR). DRAGONSself-consistently couples a semi-analytic galaxy-formation model with theinhomogeneous ionizing UV background, and can therefore be used to study thedependence of morphology and statistics of reionization on feedback phenomenaof the ionizing source galaxy population. Changes in galaxy-formation physicsmodify the sizes of HII regions and the amplitude and shape of 21-cm powerspectra. Of the galaxy physics investigated, we find that supernova feedbackplays the most important role in reionization, with HII regions up to $\approx20$ per cent smaller and a fractional difference in the amplitude of powerspectra of up to $\approx 17$ per cent at fixed ionized fraction in the absenceof this feedback. We compare our galaxy-formation-based reionization modelswith past calculations that assume constant stellar-to-halo mass ratios andfind that with the correct choice of minimum halo mass, such models can mimicthe predicted reionization morphology. Reionization morphology at fixed neutralfraction is therefore not uniquely determined by the details of galaxyformation, but is sensitive to the mass of the haloes hosting the bulk of theionizing sources. Simple EoR parametrizations are therefore accurate predictorsof reionization statistics. However, a complete understanding of reionizationusing future 21-cm observations will require interpretation with realisticgalaxy-formation models, in combination with other observations.

Dark-ages reionization & galaxy formation simulation V: morphology and statistical signatures of reionization