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Abstract: We use a combination of three large N-body simulations to investigate thedependence of dark matter halo concentrations on halo mass and redshift in theWMAP year 5 cosmology. The median relation between concentration and mass isadequately described by a power-law for halo masses in the range 10^11 - 10^15Msol-h and redshifts z < 2, regardless of whether the halo density profiles arefit using NFW or Einasto profiles. Compared with recent analyses of theMillennium Simulation, which uses a value of sigma 8 that is higher thanallowed by WMAP5, z = 0 halo concentrations are reduced by factors ranging from23 per cent at 10^11 Msol-h to 16 per cent at 10^14 Msol-h. The predictedconcentrations are much lower than inferred from X-ray observations of groupsand clusters.



Autor: Alan R. Duffy 1 and 2, Joop Schaye 2, Scott T. Kay 1, Claudio Dalla Vecchia 2, 1 Jodrell Bank Centre for Astrophysics, 2 Leiden O

Fuente: https://arxiv.org/







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