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We evaluate the effect of a supersonic relative velocity between the baryonsand dark matter on the thermal and density evolution of the first gas clouds atz < 50. Through a series of cosmological simulations, initialized at z=100 witha range of relative streaming velocities and minihalo formation redshifts, wefind that the typical streaming velocities will have little effect on the gasevolution. Once the collapse begins, the subsequent evolution of the gas willbe nearly indistinguishable from the case of no streaming, and star formationwill still proceed in the same way, with no change in the characteristic PopIII stellar masses. Reionization is expected to be dominated by halo masses of> 10^8 M_sun, for which the expected effect of streaming is negligible.

Effect of Streaming Motion of Baryons Relative to Dark Matter on the Formation of the First Stars