The dependence of dark halo clustering on the formation epoch and the concentration parameter

Details The dependence of dark halo clustering on the formation epoch and the concentration parameter The dependence of dark halo clustering on the formation epoch and the concentration parameter

2006-10-04

arxiv.org/abs/astro-ph/0610099v2

Astrophys.J.657:664-668,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 2 figures, accepted; in ApJ March 10 issue

Scientific paper

10.1086/511130

We examine the age-dependence of dark matter halo clustering in an unprecedented accuracy using a set of 7 high-resolution cosmological simulations each with $N=1024^3$ particles. We measure the bias parameters for halos over a large mass range using the cross-power-spectrum method that can effectively suppress the random noise even in the sparse sampling of the most massive halos. This enables us to find, for the first time, that younger halos are more strongly clustered than older ones for halo masses $M>10M_{\ast}$, where $M_\ast$ is the characteristic nonlinear mass scale. For $M

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