On the abundance of collapsed objects

Details On the abundance of collapsed objects On the abundance of collapsed objects

2000-07-19

arxiv.org/abs/astro-ph/0007284v2

Astrophys.J. 558 (2001) L79-L82

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, revised version accepted in the ApJL

Scientific paper

10.1086/323597

The redshift dependence of the abundance of collapsed objects places strong constraints on cosmological models of structure formation. We apply a recently proposed model describing the anisotropic collapse of inhomogeneous spatial domains. Compared with the spherical top-hat model, this generic model leads to significantly more collapsed objects at high redshifts: at redshift one and on the scale of rich clusters a factor of 65. Furthermore, for a fixed normalization of the initial fluctuation spectrum (\sigma_8=1), we predict four times as much presently collapsed objects on the mass-scale of rich clusters within the standard CDM cosmogony, compared to the spherical collapse.

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