Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-01-07
Astrophys.J.694:893-901,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
9 pages, 10 figures, accepted for publication in ApJ, Added references
Scientific paper
10.1088/0004-637X/694/2/893
Cosmological simulations of dark matter structures have shown that the equilibrated dark matter structures have a fairly small angular momentum. It appears from these N-body simulations that the radial profile of the angular momentum has an almost universal behavior, even if the different dark matter structures have experienced very different formation and merger histories. We suggest a perturbed Jeans equation, which includes a rotational term. This is done under a reasonable assumed form of the change in the distribution function. By conjecturing that the (new) subdominant rotation term must be proportional to the (old) dominant mass term, we find a clear connection, which is in rather good agreement with the results of recent high resolution simulations. We also present a new connection between the radial profiles of the angular momentum and the velocity anisotropy, which is also in fair agreement with numerical findings. Finally we show how the spin parameter $\lambda$ increases as a function of radius.
An Jin H.
Hansen Steen H.
Maccio' Andrea V.
Schmidt Kasper B.
Williams Liliya L. R.
No associations
LandOfFree
Dark Matter Angular Momentum Profile from the Jeans Equation 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 Dark Matter Angular Momentum Profile from the Jeans Equation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark Matter Angular Momentum Profile from the Jeans Equation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-61884