Capturing Halos at High Redshifts

Details Capturing Halos at High Redshifts Capturing Halos at High Redshifts

2006-01-11

arxiv.org/abs/astro-ph/0601233v1

Astrophys.J. 642 (2006) L85-L88

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1086/504868

We study the evolution of the mass function of dark matter halos in the concordance LCDM model at high redshift. We employ overlapping (multiple-realization) numerical simulations to cover a wide range of halo masses, 10^7-10^{15}h^{-1}M_\odot, with redshift coverage beginning at z=20. The Press-Schechter mass function is significantly discrepant from the simulation results at high redshifts. Of the more recently proposed mass functions, our results are in best agreement with Warren et al. (2005). The statistics of the simulations -- along with good control over systematics -- allow for fits accurate to the level of 20% at all redshifts. We provide a concise discussion of various issues in defining and computing the halo mass function, and how these are addressed in our simulations.

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