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We differentiate between the metal enrichment of the gas in virializedminihalos and that of the intergalactic medium at high redshift, pertinent tocosmological reionization, with the initial expectation that gas in the highdensity regions within formed dark matter halos may be more robust thusresistant to mixing with lower density intergalactic medium. Using detailedhydrodynamic simulations of gas clouds in minihalos subject to destructiveprocesses associated with the encompassing intergalactic shocks carryingmetal-enriched gas, we find, as an example, that, for realistic shocks ofvelocities of 10-100km/s, more than (90%,65%) of the high density gas withrho>500 rhob inside a minihalo virialized at z=10 of mass (10^7,10^6)Msunremains at a metallicity lower than 3% of that of the intergalactic medium byredshift z=6. It may be expected that the high density gas in minihalos becomesfuel for subsequent star formation, when they are incorporated into largerhalos where efficient atomic cooling can induce gas condensation hence starformation. Since minihalos virialize at high redshift when the universe is notexpected to have been significantly reionized, the implication is that gas invirialized minihalos may provide an abundant reservoir of primordial gas topossibly allow for the formation of Population-III metal-free stars to extendto much lower redshift than otherwise expected based on the enrichment ofintergalactic medium.

Lower Metal Enrichment of Virialized Gas in Minihalos