The Halo Mass Function Redshift Dependence

Details The Halo Mass Function Redshift Dependence The Halo Mass Function Redshift Dependence

2006-08-14

arxiv.org/abs/astro-ph/0608291v1

Astrophys.J.653:L77-L80,2006

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/510582

It has recently been shown that the correct halo mass function high mass behaviour may be obtained by an appropriate treatment of the all-mass-at-center problem. Here we show that the treatment of this problem leads to an accumulated mass fraction, F, which is not a universal function of the linear variance of the density contrast, but depends also on the shape of the power spectrum. For relevant power spectra F is a universal function of two quantities: the linear variance and a quantity related to the local shape (at the given mass scale) of the power spectrum. This implies, for a given shape of the power spectrum, a redshift dependence of the mass function, which is quite important for a cold dark matter power spectrum. Our results are in good agreement with numerical simulations.

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