Scaling Evolution of Universal Dark-Matter Halo Density Profiles

Details Scaling Evolution of Universal Dark-Matter Halo Density Profiles Scaling Evolution of Universal Dark-Matter Halo Density Profiles

1998-10-10

arxiv.org/abs/astro-ph/9810168v1

Astronomy and Astrophysics

Astrophysics

9 pages, 1 Table and 1 postscript figure, latex uses aaspp4.sty, accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/311737

Dark-matter halos show a universal density profile with a scaling such that less massive systems are typically denser. This mass-density relation is well described by a proportionality between the characteristic density of halos and the mean cosmic density at halo formation time. It has recently been shown that this proportionality could be the result of the following simple evolutionary picture. Halos form in major mergers with essentially the same, cosmogony-dependent, dimensionless profile, and then grow inside-outside, as a consequence of accretion. Here we verify the consistency of this picture and show that it predicts the correct zero point of the mass-density relation.

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