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03 October 2022
  » arxiv » astro-ph/0404415

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Breaking the mass / anisotropy degeneracy in the Coma cluster
Gary A. Mamon ; Ewa L. Lokas & Teresa Sanchis ;
Date 21 Apr 2004
Journal IAU Colloq. 195 (Cambridge Univ. Press), p. 413 (2004) DOI: 10.1017/S1743921304000869
Subject astro-ph
Affiliation IAP, Paris, France, Copernicus Center, Warsaw, Poland, Dep. di Astronomia i Meteorologia, Univ. de Barcelona, Spain
AbstractWe provide the first direct lifting of the mass/anisotropy degeneracy for a cluster of galaxies, by jointly fitting the line of sight velocity dispersion and kurtosis profiles of the Coma cluster, assuming an NFW tracer density profile, a generalized-NFW dark matter profile and a constant anisotropy profile. We find that the orbits in Coma must be quasi-isotropic, and find a mass consistent with previous analyses, but a concentration parameter 50% higher than expected in cosmological N-body simulations. We then test the accuracy of our method on realistic non-spherical systems with substructure and streaming motions, by applying it to the ten most massive structures in a cosmological N-body simulation. We find that our method yields fairly accurate results on average (within 20%), although with a wide variation (factor 1.7 at 1 sigma) for the concentration parameter, with decreased accuracy and efficiency when the projected mean velocity is not constant with radius.
Source arXiv, astro-ph/0404415
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