First Generation of Bound Objects in the Universe

Details First Generation of Bound Objects in the Universe First Generation of Bound Objects in the Universe

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acppb..32..227s&link_type=abstract

Acta Physica Polonica B, vol. 32, Issue 1, p.227

Physics

5

Scientific paper

We study the formation of first bound objects in the Universe after recombination. We trace the evolution of a spherically symmetric density perturbation in the Ω =1 Cold Dark Matter (CDM) model with baryon and dark matter contributions, respectively, Ω b=0.1 and Ω dm=0.9. Physical processes in the collapsing gas relevant to various stages of the nonlinear collapse of low mass objects are considered. We find that the first density perturbations which collapse to form luminous objects have baryon mass in the range 103--104 M&sun; . The final collapse of these objects is triggered by the cooling due to H2 molecules and it starts early at redshifts z ˜ 20. The role of the initial baryon overdensity in the collapse of density perturbations in CDM model is studied.

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