A universal density slope - velocity anisotropy relation for relaxed structures

Details A universal density slope - velocity anisotropy relation for relaxed structures A universal density slope - velocity anisotropy relation for relaxed structures

2004-11-16

arxiv.org/abs/astro-ph/0411473v3

New Astron. 11 (2006) 333

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures. Extended discussion. Conclusions unchanged. Matches accepted version

Scientific paper

10.1016/j.newast.2005.09.001

We identify a universal relation between the radial density slope \alpha (r) and the velocity anisotropy \beta (r) for equilibrated structures. This relation holds for a variety of systems, including disk galaxy mergers, spherical collapses, cold dark matter (CDM) halos both with and without cooling. We argue that the shape of the relation is reasonable from fundamental principles when the dark matter or stars are assumed to obey Tsallis statistics, and in that case we fit the \alpha - \beta relation with just one free parameter. One can use this result to close the Jeans equations, for example to construct mass models of elliptical galaxies from observational data or to tune dark matter direct detection experiments. We also predict the asymptotic central slope and anisotropy of CDM halos to be approximately -1 and 0.

Affiliated with

Also associated with

No associations

Rating

A universal density slope - velocity anisotropy relation for relaxed structures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A universal density slope - velocity anisotropy relation for relaxed structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A universal density slope - velocity anisotropy relation for relaxed structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-654140