The Structure and Dynamics of Cold Dark Matter Halos

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 \(\sim -4/3\) in the central regions and may not have converged to a unique result...

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Bibliographic Details
Published in:arXiv.org 1997-11
Main Authors: Moore, Ben, Ghigna, Sebastiano, Governato, Fabio, Lake, George, Quinn, Tom, Stadel, Joachim
Format: Article
Language:English
Subjects:
Cold dark matter
Dark matter
Dynamic structural analysis
Galactic clusters
Galactic halos
Galaxies
Galaxy distribution
Online Access:Get full text
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Summary: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 \(\sim -4/3\) 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, \(R_{200}\), and force softening that is \(\sim 0.2% R_{200}\). 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.
ISSN:2331-8422