Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389...68p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 68-78. Research supported by CNR and MURST.
Other
18
Astronomical Catalogs, Galactic Clusters, Galactic Evolution, Galactic Mass, Mass Distribution, Astronomical Models, Luminosity, Virial Theorem
Scientific paper
The problem of estimating the mass distribution of groups of galaxies is addressed by analyzing the extent to which the observational estimate of the group mass distribution is sensitive to the features of the catalogs and, in particular, to the mass estimators. The observational mass distribution of the catalogs GH83, T87, and MDL89 is compared, and a significant inhomogeneity is found. The same result is obtained by considering other dynamical parameters such as the velocity dispersion, crossing time, and dynamical state. Owing to the sensitivity of the physical parameters of groups to the group identification algorithms, two different families of observed groups are defined: Cfof contains groups obtained by using the friends-of-friends identification algorithm with a low number-density contrast, while Chc contains groups obtained by using the hierarchical clustering algorithm. The relevance of the bias affecting the observational estimate of the mass distribution is clarified.
Giuricin Giuliano
Mardirossian Fabio
Mezzetti Marino
Pisani Armando
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