Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-08
Astrophys.J. 586 (2003) 12-16
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures. Accepted for Publication in ApJ with minor changes required
Scientific paper
10.1086/367606
Self-interacting dark matter was proposed by Spergel & Steinhardt (2000) to alleviate two conflicts between Cold Dark Matter (CDM) models and observations. Firstly, CDM N-body simulations predict dark matter halo density profiles that diverge at the centre in disagreement with the constant density cores observed in late-type dwarf and Low Surface Brightness (LSB) galaxies. Secondly, N-body simulations predict an overabundance of subhalos in the Galactic halo. Using a simple semi-analytical argument we show that weakly self-interacting dark matter models, which can produce halo cores of the sizes observed in dark matter dominated galaxies, are unable to reconcile the number of satellites in the Galactic halo with the observed number of dwarf galaxies in the Local Group.
Burkert Andreas
D'Onghia Elena
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