Universal properties of Dark Matter halos

Details Universal properties of Dark Matter halos Universal properties of Dark Matter halos

2009-11-18

arxiv.org/abs/0911.3396v2

Phys.Rev.Lett.104:191301,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 1 figure, revtex. Final version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.104.191301

We discuss the universal relation between density and size of observed Dark Matter halos that was recently shown to hold on a wide range of scales, from dwarf galaxies to galaxy clusters. Predictions of LambdaCDM N-body simulations are consistent with this relation. We demonstrate that this property of LambdaCDM can be understood analytically in the secondary infall model. Qualitative understanding given by this model provides a new way to predict which deviations from LambdaCDM or large-scale modifications of gravity can affect universal behavior and, therefore, to constrain them observationally.

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