Dark Matter Halos: The Dynamical Basis of Effective Empirical Models
arXiv:1010.2602 · doi:10.1155/2011/903429
Abstract
We investigate the dynamical basis of the classic empirical models (specifically, Sersic-Einasto and generalized NFW) that are widely used to describe the distributions of collisionless matter in galaxies. We submit that such a basis is provided by our α-profiles, shown to constitute solutions of the Jeans dynamical equilibrium with physical boundary conditions. We show how to set the parameters of the empirical in terms of the dynamical models; we find the empirical models, and specifically Sersic-Einasto, to constitute a simple and close approximation to the dynamical models. Finally, we discuss how these provide an useful baseline for assessing the impact of the small-scale dynamics that may modulate the density slope in the central galaxy regions.
11 pages, 2 figures, Accepted by Advances in Astronomy
References in corpus (12)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- A direct empirical proof of the existence of dark matter
- The redshift dependence of the structure of massive LCDM halos
- The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
- The dramatic size evolution of elliptical galaxies and the quasar feedback
- A universal density slope - velocity anisotropy relation for relaxed structures
- Erasing Dark Matter Cusps in Cosmological Galactic Halos with Baryons
- Assembly History and Structure of Galactic Cold Dark Matter Halos
- The dynamical structure of dark matter haloes
- Evolution of Phase-Space Density in Dark Matter Halos
- Alas, the dark matter structures were not that trivial
- Structure and History of Dark Matter Halos Probed with Gravitational Lensing
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- A Statistical Semi-Empirical Model: Satellite galaxies in Groups and Clusters
- A halo model approach to describe clustering and emission of the two main star forming galaxy populations for Cosmic Infrared Background studies