The Formation of the First Globular Clusters in Dwarf Galaxies before the Epoch of Reionization

  • Bromm V
  • Clarke C
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Abstract

We explore a mechanism for the formation of the first globular clusters, operating during the assembly of dwarf galaxies at high redshifts, z > 10. The substructure in the dark matter and the corresponding potential wells are responsible for setting the cluster scale of ~10^5 M_sun. The second mass scale in the formation problem, the stellar scale of ~1 M_sun, is determined in turn by the processes that cool the gas. We address the origin of the first, cluster scale by means of three-dimensional numerical simulations of the collapsing dark matter and gaseous components. We find that the gas falls into the deepest dark subhalos, resulting in a system of ~ 5 proto-globular clouds. The incipient globular clusters lose their individual dark halos in the process of violent relaxation, leading to the build-up of the general dark halo around the dwarf galaxy.

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Bromm, V., & Clarke, C. J. (2002). The Formation of the First Globular Clusters in Dwarf Galaxies before the Epoch of Reionization. The Astrophysical Journal, 566(1), L1–L4. https://doi.org/10.1086/339440

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