On Universal Halos and the Radial Orbit Instability

Details On Universal Halos and the Radial Orbit Instability On Universal Halos and the Radial Orbit Instability

2006-04-19

arxiv.org/abs/astro-ph/0604418v1

Astrophys.J.653:43-52,2006

Astronomy and Astrophysics

Astrophysics

31 pages, 11 figures, submitted to the Astrophysical Journal

Scientific paper

10.1086/508602

The radial orbit instability drives dark matter halos toward a universal structure. This conclusion, first noted by Huss, Jain, and Steinmetz, is explored in detail through a series of numerical experiments involving the collapse of an isolated halo into the non-linear regime. The role played by the radial orbit instability in generating the density profile, shape, and orbit structure is carefully analyzed and, in all cases, the instability leads to universality independent of initial conditions. New insights into the underlying physics of the radial orbit instability are presented.

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