# Plan β: core or cusp?

@article{Richardson2013PlanC,
title={Plan $\beta$: core or cusp?},
author={T R G Richardson and Douglas Spolyar and Matthew D. Lehnert},
journal={Monthly Notices of the Royal Astronomical Society},
year={2013},
volume={440},
pages={1680-1689}
}
• Published 6 November 2013
• Physics
• Monthly Notices of the Royal Astronomical Society
The inner profile of Dark Matter (DM) halos remains one of the central problems in small-scale cosmology. At present, the problem can not be resolved in dwarf spheroidal galaxies due to a degeneracy between the DM profile and the velocity anisotropy beta of the stellar population. We discuss a method which can break the degeneracy by exploiting 3D positions and 1D line-of-sight (LOS) velocities. With the full 3D spatial information, we can determine precisely what fraction of each stars LOS…

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