Abstract
The time evolution of the velocity dispersion as a function of radius, called σv-profiles, of threeN-body simulations of Wielen are presented in units ofr/R G (whereR G is the gravitational or virial radius) and discussed as a function of mass sample. The evolution of the radial and tangential components of the velocity dispersion is discussed, and each σv-profile is fitted to a simple power law in the halo (0.15≤r/R G≤2.0). Several structural features appear at late time intervals: (a) an upturn in the radial component of σv which occurs in a decreasing shell (closer to the core) in time, (b) the σv-profile of the massive particles mimics that of the total sample, since equipartition of kinetic energy does not obtain, and (c) a local minimum atr∼0.3–0.5R G appears in one model which coincides with the local minimum in the number density profiles and possibly with feature (a).
The line-of-sight σv-profile, called σLS-profile, of each model as a function of time and mass sample are also presented and discussed. They contain the same structural features as the σv-profiles. Projection factors at small radii are also discussed. The σLS-profiles of the models can be compared with the observed velocity dispersion profiles of clusters of galaxies in Struble (1979a).
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Struble, M.F. Velocity dispersion profiles ofN-body simulations. Astrophys Space Sci 64, 319–337 (1979). https://doi.org/10.1007/BF00639512
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DOI: https://doi.org/10.1007/BF00639512