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

被引：792

作者：

Duffy, Alan R. ^{[1
,2
]}

Schaye, Joop ^{[2
]}

Kay, Scott T. ^{[1
]}

Dalla Vecchia, Claudio ^{[2
]}

机构：

[1] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2008年 / 390卷 / 01期

关键词：

methods: N-body simulations; galaxies: clusters: general; galaxies: haloes; cosmological parameters; cosmology: theory; dark matter;

D O I：

10.1111/j.1745-3933.2008.00537.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：L64 / L68

页数：5