An Analytical Approach to the Spin-Distribution of Dark Halos

Details An Analytical Approach to the Spin-Distribution of Dark Halos An Analytical Approach to the Spin-Distribution of Dark Halos

2002-04-13

arxiv.org/abs/astro-ph/0204221v1

Astrophys.J. 581 (2002) 794-798

Astronomy and Astrophysics

Astrophysics

14 pages including two figures, submitted to ApJ Lett

Scientific paper

10.1086/344240

We derive the distribution of the dimensionless specific angular momentum of dark matter halos, $P(j)$, in the framework of the standard tidal torque theory, and explain the characteristic shape of $P(j)$ commonly observed in N-body simulations. A scalar quantity (shear scalar), $r$, is introduced for measuring the effective strength of the tidal torque force acting upon the halo from the surrounding matter. It is found that the ubiquitous and broad shape of $P(j)$ can mostly be attributed to the unique property of the shear scalar $r$, and also that $P(j)$ is insensitve to the underlying collapse dynamics. Our result demonstrates that although the shape of $P(j)$ is ubiquitous and close to log-normal, the distribution is not exactly log-normal but decays exponentially at the high angular momentum end, and drops slowly as a power-law with an index 2 at the low angular momentum end.

Affiliated with

Also associated with

No associations

Rating

An Analytical Approach to the Spin-Distribution of Dark 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 An Analytical Approach to the Spin-Distribution of Dark Halos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Analytical Approach to the Spin-Distribution of Dark Halos will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-437090