Document Mass Profiles and Shapes of Cosmological Structures
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 55-58
DOI: 10.1051/eas:2006047
Evolution and Origin of Dark Halo Density Profiles
E. Salvador-Solé1, A. Manrique1 and G. González-Casado21 Dept. d'Astronomia i Meteorologia, Univ. de Barcelona, Spain
2 Dept. de Matemàtica Aplicada II, Univ. Politeècnica de Catalunya, Spain
Abstract
N-body simulations show that dark matter haloes develop from the
inside out in phases of smooth accretion between major mergers. In
these conditions it can be shown that the density profile of
ellipsoidal anisotropic rotating haloes is completely determined by
the current values of their extensive properties and their
corresponding accretion rates. This allows us to build a simple
physical model for the evolution of the NFW scale radius. Moreover,
since we can arbitrarily assume that a halo has grown by pure
accretion, the inside-out growth condition automatically leads to the
halo density profile. We find that the typical accretion rate
predicted by the extended Press-Schechter formalism in any given
cosmology leads to a typical density profile of the NFW form for the
correct mass-concentration relation.
© EAS, EDP Sciences 2006