Structure of Dark Matter Halos from Hierarchical Clustering. III. Shallowing of the Inner Cusp

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Abstract
We investigate the structure of the dark matter halo formed in the cold dark matter scenarios by N-body simulations with a parallel tree code on GRAPE cluster systems. We simulated eight halos with the mass of 4.4 × 1014 to 1.6 × 1015 M☉ in SCDM and LCDM models using up to 30 million particles. With the resolution of our simulations, the density profile is reliable down to 0.2% of the virial radius. Our results show that the slope of inner cusp within 1% virial radius is shallower than -1.5, and the radius where the shallowing starts exhibits run-to-run variation, which means that the innermost profile is not universal.
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