The Structure and Dynamics of Cold Dark Matter Halos

1997/11/21 by Ben Moore, Moore, Ben, Sebastiano Ghigna +9 · 81 citations
Physics and Astronomy · #Astrophysics #Cluster (spacecraft) #Cold dark matter #Cuspy halo problem #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Physics #RADIUS #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #Virial theorem #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9711259

published in arXiv (Cornell University) (Cornell University) · Summary of results presented at the UC Santa Cruz workshop on "Galactic Halos" and the Potsdam Cosmology Workshop on "Large Scale Structure: Tracts and Traces"

arxiv created 1997/11/21 · openalex publication_date 1997/11/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate the internal structure of cold dark matter halos using high resolution N-body simulations. As the mass and force resolution are increased, halo density profiles become steeper, asymptoting to a slope of ∼ -4/3 in the central regions and may not have converged to a unique result. At our highest resolution we have nearly 3 million particles within the virial radius, R₂₀₀, and force softening that is ∼ 0.2% R₂₀₀. This resolution has also allowed us to resolve a large part of the overmerging problem - we find over 1000 surviving dark halos orbiting within a single cluster potential. These data have given us unprecedented insights into the dynamics and structure of ``halos within halos'', allowing us for the first time, to compare the distribution of dark matter with observations of galaxies in clusters.

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