Structure of Dark Matter Halos From Hierarchical Clustering. III. Shallowing of The Inner Cusp

Details Structure of Dark Matter Halos From Hierarchical Clustering. III. Shallowing of The Inner Cusp Structure of Dark Matter Halos From Hierarchical Clustering. III. Shallowing of The Inner Cusp

2003-06-10

arxiv.org/abs/astro-ph/0306203v1

Astrophys.J. 606 (2004) 625-634

Astronomy and Astrophysics

Astrophysics

26 pages, 16 fugures, submitted to ApJ

Scientific paper

10.1086/383192

We investigate the structure of the dark matter halo formed in the cold dark matter scenarios by N-body simulations with parallel treecode on GRAPE cluster systems. We simulated 8 halos with the mass of $4.4\times 10^{14}M_{\odot}$ to $1.6\times 10^{15}M_{\odot}$ in the SCDM and LCDM model using up to 30 million particles. With the resolution of our simulations, the density profile is reliable down to 0.2 percent of the virial radius. Our results show that the slope of inner cusp within 1 percent virial radius is shallower than -1.5, and the radius where the shallowing starts exhibits run-to-run variation, which means the innermost profile is not universal.

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