We analyze the density profiles and virial radii for a sample of 90 nearby clusters, using galaxies with available redshifts and positions. Each cluster has at least 20 redshifts meadured within an Abell radius, and all the results come from galaxy sets of at least 20 members. Most of the density profiles of our clusters are well fitted by hydrostatic-isothermal-like profiles. The slopes we find for many cluster density profiles are consistent with the hypothesis that the galaxies are in equilibrium with the binding cluster potential. The virial radii correlate with the core radii at a very high significance level. The observed relationship between the two sizes estimates is in agreement with the theoretical one computed by using the median values of the density profile parameters fitted on our clusters.
Optical radii of 90 galaxy clusters
GIRARDI, MARISA;GIURICIN, GIULIANO;MARDIROSSIAN, FABIO;MEZZETTI, MARINO
1994-01-01
Abstract
We analyze the density profiles and virial radii for a sample of 90 nearby clusters, using galaxies with available redshifts and positions. Each cluster has at least 20 redshifts meadured within an Abell radius, and all the results come from galaxy sets of at least 20 members. Most of the density profiles of our clusters are well fitted by hydrostatic-isothermal-like profiles. The slopes we find for many cluster density profiles are consistent with the hypothesis that the galaxies are in equilibrium with the binding cluster potential. The virial radii correlate with the core radii at a very high significance level. The observed relationship between the two sizes estimates is in agreement with the theoretical one computed by using the median values of the density profile parameters fitted on our clusters.Pubblicazioni consigliate
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