Formation of Compact Stellar Clusters by High-Redshift Galaxy Outflows II: Effect of Turbulence and Metal-Line Cooling

摘要

In the primordial universe, low mass structures with virial temperatures lessthan 10$^{4}$ K were unable to cool by atomic line transitions, leading to astrong suppression of star formation. On the other hand, these "minihalos" werehighly prone to triggered star formation by interactions from nearby galaxyoutflows. In Gray & Scannapieco (2010), we explored the impact ofnonequilibrium chemistry on these interactions. Here we turn our attention tothe role of metals, carrying out a series of high-resolution three-dimensionaladaptive mesh refinement simulations that include both metal cooling and asubgrid turbulent mixing model. Despite the presence of an additional coolant,we again we find that outflow-minihalo interactions produce a distribution ofdense, massive stellar clusters. We also find that these clusters are evenlyenriched with metals to a final abundance of Z $\approx$ 10$^{-2}$ Z$_{\odot}$.As in our previous simulations, all of these properties suggest that theseinteractions may have given rise to present-day halo globular clusters.