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The early Universe hosted a large population of small dark matter `minihalos'that were too small to cool and form stars on their own. These existed asstatic objects around larger galaxies until acted upon by some outsideinfluence. Outflows, which have been observed around a variety of galaxies, canprovide this influence in such a way as to collapse, rather than disperse theminihalo gas. Gray & Scannapieco performed an investigation in which idealizedspherically-symmetric minihalos were struck by enriched outflows. Here weperform high-resolution cosmological simulations that form realistic minihalos,which we then extract to perform a large suite of simulations ofoutflow-minihalo interactions including non-equilibrium chemical reactions. Inall models, the shocked minihalo forms molecules through non-equilibriumreactions, and then cools to form dense chemically homogenous clumps ofstar-forming gas. The formation of these high-redshift clusters will beobservable with the next generation of telescopes, and the largest of themshould survive to the present day, having properties similar to halo globularclusters.

Formation of Compact Clusters from High Resolution Hybrid Cosmological Simulations