Bibcode
Duffy, Alan R.; Schaye, Joop; Kay, Scott T.; Dalla Vecchia, C.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society: Letters, Volume 390, Issue 1, pp. L64-L68.
Advertised on:
10
2008
Citations
826
Refereed citations
776
Description
We use a combination of three large N-body simulations to investigate
the dependence of dark matter halo concentrations on halo mass and
redshift in the Wilkinson Microwave Anisotropy Probe year 5 (WMAP5)
cosmology. The median relation between concentration and mass is
adequately described by a power law for halo masses in the range
1011-1015h-1Msolar and
redshifts z < 2, regardless of whether the halo density profiles are
fitted using Navarro, Frenk & White or Einasto profiles. Compared
with recent analyses of the Millennium Simulation, which uses a value of
σ8 that is higher than allowed by WMAP5, z = 0 halo
concentrations are reduced by factors ranging from 23 per cent at
1011h-1Msolar to 16 per cent at
1014h-1Msolar. The predicted
concentrations are much lower than inferred from X-ray observations of
groups and clusters.