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2006•EAS Publications SeriesRequires access

Structure of Dark Matter Halos from Hierarchical Clustering

Toshiyuki Fukushige

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Abstract

We investigated 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 (Fukushige et al. 2004, ApJ, 606, 625). We simulated 8 halos with the mass of 4.4 × 1014 M๏ to 1.6 × 1015 M๏ 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.

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What this paper is about

We investigated 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 (Fukushige et al. 2004, ApJ, 606, 625). We simulated 8 halos with the mass of 4.4 × 1014 M๏ to 1.6 × 1015 M๏ 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.

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Available abstract

We investigated 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 (Fukushige et al. 2004, ApJ, 606, 625). We simulated 8 halos with the mass of 4.4 × 1014 M๏ to 1.6 × 1015 M๏ 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.

Key concepts: Halo, Physics, Dark matter, Virial theorem, RADIUS, Cuspy halo problem, Astrophysics, Cold dark matter

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