Status Report

Evolution of the Mass Function of Dark Matter Haloes

By SpaceRef Editor
January 16, 2003
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Astrophysics, abstract

From: Darren Reed <>
Date: Wed, 15 Jan 2003 03:00:34 GMT (118kb)

Evolution of the Mass Function of Dark Matter Haloes

Darren Reed (Univ. of Washington),
Jeffrey Gardner (Univ. of Pittsburg),
Thomas Quinn (Univ. of Washington),
Joachim Stadel (Univ. of Zurich),
Mark Fardal (Univ. of Victoria),
George Lake (Univ. of Washington),
Fabio Governato (Univ. of Washington)

Comments: 8 pages, 10 figures, submitted to MNRAS

We use a high resolution $Lambda$CDM numerical simulation to calculate the
mass function of dark matter haloes down to the scale of dwarf galaxies, back
to a redshift of fifteen. The Sheth and Tormen mass function provides an
excellent match to all of our data except for redshifts of ten and higher,
where it overpredicts halo numbers increasingly with redshift, reaching roughly
50 percent by redshift 15. Our results confirm that the simulated halo mass
function, as a function of linear density enhancement, is invariant with
redshift, and thus depends only on the linear density fluctuation field. We
provide an empirical fit to our data that corrects for the overprediction of
extremely rare objects by the Sheth and Tormen mass function.

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