Primordial Star Forming Regions in a CDM Universe

Details Primordial Star Forming Regions in a CDM Universe Primordial Star Forming Regions in a CDM Universe

1996-11-26

arxiv.org/abs/astro-ph/9611224v1

Astronomy and Astrophysics

Astrophysics

4 pages, with one figure that prints in color. To appear in the proceedings of the 7th Annual Astrophysics Conference in Maryl

Scientific paper

10.1063/1.52749

We developed a three-dimensional 2-level hierarchical cosmological code with a realistic and robust treatment of multi-species non-equilibrium ionization and radiative cooling processes, and use it to investigate primordial star forming regions that originate from high-\sigma perturbations in a standard CDM dominated cosmology. We find it is possible to produce gravitationally bound and cooled structures at very high redshift (z ~ 40) with baryonic masses as small as ~1000Ms. The molecular hydrogen formation in these small scale structures follows very well the analytical predictions of Abel (1995) and Tegmark et al. (1996). We also discuss the minimum mass that cosmological structures must have in order to be able to cool and collapse.

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