Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..60..267o&link_type=abstract
Astrophysics and Space Science, vol. 60, no. 2, Feb. 1979, p. 267-275.
Astronomy and Astrophysics
Astrophysics
4
Galactic Clusters, Gravitational Effects, Potential Energy, Spatial Distribution, Systems Stability, Astronomical Models, Statistical Analysis, Stellar Mass, Virial Theorem
Scientific paper
The contribution of gravitationally bound subsystems to the potential energy of systems of galaxies is investigated. A statistical correction factor to the virial mass is derived by using Holmberg's observed frequency function of multiple galaxies. It is of the order of ten for groups of galaxies and negligible for rich clusters. However, the necessity of an individual treatment is emphasized. As an illustration, the contribution to the binding energy by observed binary galaxies in the de Vaucouleurs groups 48 and 49 and the Coma Cluster is calculated. In all three cases a single double galaxy removes the virial mass paradox. It is concluded that corrections for subclustering are substantial in stability analyses of systems of galaxies, that they can easily remove mass discrepancies of the order of ten in groups and rich clusters, and that they should be made individually and not statistically.
Ozernoi L. M.
Reinhardt Michael
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