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Using a high-resolution cosmological numerical simulation, we have analyzedthe evolution of galaxies at z~10 in a highly overdense region of the universe.These objects could represent the high redshift galaxies recently observed bythe Hubble's WFC3, and be as well possible precursors of QSOs at z~6-7. Toovercome the sampling and resolution problems in cosmological simulations, wehave used the Constrained Realizations method. Our main result for z~10 showsthe region of 3.5h^{-1}Mpc radius in comoving coordinates completely dominatedby disk galaxies in the total mass range of >=10^9h^{-1}Mo. We have verifiedthat the gaseous and stellar disks we identify are robust morphologicalfeatures, capable of surviving the ongoing merger process at these redshifts.Below this mass range, we find a sharp decline in the disk fraction tonegligible numbers. At this redshift, the disks appear to be gas-rich and thedark matter halos baryon-rich, by a factor of ~2-3 above the average fractionof baryons in the universe. The prevalence of disk galaxies in the high densitypeaks during the epoch of reionization is contrary to the morphology-densitytrend observed at low redshifts.

Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos