Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 390, Issue 1, Pages L64-L68Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2008.00537.x
Keywords
methods: N-body simulations; galaxies: clusters: general; galaxies: haloes; cosmological parameters; cosmology: theory; dark matter
Categories
Funding
- STFC
- Marie Curie ETS
- ESF
- Marie Curie Excellence [MEXT-CT-2004-014112]
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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 10(11)-10(15) h(-1) M-circle dot 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 sigma(8) that is higher than allowed by WMAP5, z = 0 halo concentrations are reduced by factors ranging from 23 per cent at 10(11) h(-1) M-circle dot to 16 per cent at 10(14) h(-1) M-circle dot. The predicted concentrations are much lower than inferred from X-ray observations of groups and clusters.
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