We investigate the dynamical basis of the classic empirical models (specifically, Sérsic-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 Sérsic-Einasto, to constitute a simple and close approximation to the dynamical models. Finally, we discuss how these provide a useful baseline for assessing the impact of the small-scale dynamics that may modulate the density slope in the central galaxy regions.
Lapi, A., & Cavaliere, A. (2011). Dark Matter Halos: the dynamical basis of effective empirical models. ADVANCES IN ASTRONOMY, 2011.
Tipologia: | Articolo su rivista |
Citazione: | Lapi, A., & Cavaliere, A. (2011). Dark Matter Halos: the dynamical basis of effective empirical models. ADVANCES IN ASTRONOMY, 2011. |
Lingua: | English |
Settore Scientifico Disciplinare: | Settore FIS/05 - Astronomia e Astrofisica |
Revisione (peer review): | Sì, ma tipo non specificato |
Tipo: | Articolo |
Rilevanza: | Rilevanza internazionale |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1155/2011/903429 |
Stato di pubblicazione: | Pubblicato |
Data di pubblicazione: | 2011 |
Titolo: | Dark Matter Halos: the dynamical basis of effective empirical models |
Autori: | |
Autori: | Lapi, A; Cavaliere, A |
Appare nelle tipologie: | 01 - Articolo su rivista |