Hierarchical Object Formation in the Peculiar Velocity Field

Details Hierarchical Object Formation in the Peculiar Velocity Field Hierarchical Object Formation in the Peculiar Velocity Field

2005-08-02

arxiv.org/abs/astro-ph/0508069v3

Astrophys.J.634:20-25,2005

Astronomy and Astrophysics

Astrophysics

16 pages; This version corrects errors in equations and figures of the published version; The errors are also corrected in the

Scientific paper

10.1086/491725

Using the initial peculiar velocity field, we analytically study the hierarchical formation of gravitationally bound objects. The field is smoothed over a scale that corresponds to the mass of a given class of objects. Through the Zel'dovich approximation, the smoothed field determines how the objects cluster together to form a new class of more massive objects. The standard cosmological parameters lead to the evolution of primordial clouds with 10^6 M(sun) -> galaxies with 10^12 M(sun) -> clusters of galaxies with 10^15 M(sun) -> superclusters of galaxies with 10^16 M(sun). The epochs obtained for the formation of these classes of objects are consistent with observations.

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