Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-16
Astrophys.J.646:881-885,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, submitted to ApJL
Scientific paper
10.1086/504962
The predicted mass function of dark matter halos is essential in connecting observed galaxy cluster counts and models of galaxy clustering to the properties of the primordial density field. We determine the mass function in the concordance $\Lambda$CDM cosmology, as well as its uncertainty, using sixteen $1024^3$-particle nested-volume dark-matter simulations, spanning a mass range of over five orders of magnitude. Using the nested volumes and single-halo tests, we find and correct for a systematic error in the friends-of-friends halo-finding algorithm. We find a fitting form and full error covariance for the mass function that successfully describes the simulations' mass function and is well-behaved outside the simulations' resolutions. Estimated forecasts of uncertainty in cosmological parameters from future cluster count surveys have negligible contribution from remaining statistical uncertainties in the central cosmology multiplicity function. There exists a potentially non-negligible cosmological dependence (non-universality) of the halo multiplicity function.
Abazajian Kevork
Holz Daniel E.
Teodoro Luis
Warren Michael S.
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