Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-04
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, subm to apj
Scientific paper
10.1088/0004-637X/694/2/1250
The density profile of simulated dark matter structures is fairly well-established, and several explanations for its characteristics have been put forward. In contrast, the radial variation of the velocity anisotropy has still not been explained. We suggest a very simple origin, based on the shapes of the velocity distributions functions, which are shown to differ between the radial and tangential directions. This allows us to derive a radial variation of the anisotropy profile which is in good agreement with both simulations and observations. One of the consequences of this suggestion is that the velocity anisotropy is entirely determined once the density profile is known. We demonstrate how this explains the origin of the \gamma-\beta relation, which is the connection between the slope of the density profile and the velocity anisotropy. These findings provide us with a powerful tool, which allows us to close the Jeans equations.
No associations
LandOfFree
Might we eventually understand the origin of the dark matter velocity anisotropy? 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 Might we eventually understand the origin of the dark matter velocity anisotropy?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Might we eventually understand the origin of the dark matter velocity anisotropy? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-364910