On Universal Halos and the Radial Orbit Instability

Abstract

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.

31 pages, 11 figures, submitted to the Astrophysical Journal

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• Orbital Instabilities in a Triaxial Cusp Potential
• The Radial Orbit Instability in Collisionless N-Body Simulations
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• Theoretical dark matter halo density profile
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• The behaviour of shape and velocity anisotropy in dark matter haloes
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• What galaxy masses perturb the local cosmic expansion?
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• Culminating the peak CUSP to descry the dark side of halos
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• Nature and Nurture in Dark Matter Halos
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