Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-08-29
Astrophys.J. 438 (1995) 527
Astronomy and Astrophysics
Astrophysics
28 pages, LateX file, to appear in ApJ, preprint SISSA ref 77/94/A
Scientific paper
10.1086/175099
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 measured 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 size estimates is in agreement with the theoretical one computed by using the median values of the density profile parameters fitted on our clusters. After correcting for incompleteness in our cluster sample, we provide the universal distributions functions of core and virial radii (obtained within half an Abell radius).
Biviano Andrea
Girardi Maria
Giuricin Giuliano
Mardirossian Fabio
Mezzetti Marino
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