Cluster abundance and large-scale structure

Details Cluster abundance and large-scale structure Cluster abundance and large-scale structure

2001-04-15

arxiv.org/abs/astro-ph/0104245v1

AIP Conf.Proc.586:274,2001

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, 2 tables; to appear in the proceedings of the 20th Texas Symposium on Relativistic Astrophysics, ed. H. Ma

Scientific paper

10.1063/1.1419566

We use the presently observed number density of large X-ray clusters and linear mass power spectra to constrain the shape parameter ($\Gamma$), the spectral index ($n$), the amplitude of matter density perturbations on the scale of $8 h^{-1}$Mpc ($\sigma_8$), and the redshift distortion parameter ($\beta$). The non-spherical-collapse model as an improvement to the Press-Schechter formula is used and yields significantly lower $\sigma_8$ and $\beta$. An analytical formalism for the formation redshift of halos is also derived.

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