Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-08-11
Phys.Rev.D82:104045,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
11 pages, 4 figures. Accepted by PRD
Scientific paper
10.1103/PhysRevD.82.104045
Using a generalized self-similar secondary infall model, which accounts for tidal torques acting on the halo, we analyze the velocity profiles of halos in order to gain intuition for N-body simulation results. We analytically calculate the asymptotic behavior of the internal radial and tangential kinetic energy profiles in different radial regimes. We then numerically compute the velocity anisotropy and pseudo-phase-space density profiles and compare them to recent N-body simulations. For cosmological initial conditions, we find both numerically and analytically that the anisotropy profile asymptotes at small radii to a constant set by model parameters. It rises on intermediate scales as the velocity dispersion becomes more radially dominated and then drops off at radii larger than the virial radius where the radial velocity dispersion vanishes in our model. The pseudo-phase-space density is universal on intermediate and large scales. However, its asymptotic slope on small scales depends on the halo mass and on how mass shells are torqued after turnaround. The results largely confirm N-body simulations but show some differences that are likely due to our assumption of a one-dimensional phase space manifold.
Bertschinger Edmund
Zukin Phillip
No associations
LandOfFree
Velocity Structure of Self-Similar Spherically Collapsed Halos 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 Velocity Structure of Self-Similar Spherically Collapsed Halos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity Structure of Self-Similar Spherically Collapsed Halos will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-586224