Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology

Bibcode
2008MNRAS.390L..64D
DOI
10.1111/j.1745-3933.2008.00537.x
Duffy, Alan R.; Schaye, Joop; Kay, Scott T.; Dalla Vecchia, C.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society: Letters, Volume 390, Issue 1, pp. L64-L68.

Fecha de publicación:
10
2008
Número de autores
4
Número de autores del IAC
0
Número de citas
798
Número de citas referidas
754
Descripción
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.
Tipo
Con árbitro
Métodos
Simulaciones de N-cuerpo
Galaxias
Parámetros cosmológicos
Cosmología
Materia oscura

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