Other
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1242r&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Oct. 1988, p. 1242-1247.
Other
4
Galactic Clusters, Many Body Problem, Luminosity, Radial Velocity, Signal To Noise Ratios
Scientific paper
Among the 112 Abell clusters (statistical sample) with a central supergiant cD galaxy (BM I, I - II), 84 are single (cD1) and 28 are binary (cD2). The merger of the primary and secondary components of a cD2 galaxy by means of dynamical friction transforms the cD2 source galaxy into a cD1 product galaxy. Following Tremaine (1981) ≡5 cD2 formation events occur in a BM I, I - II cluster over its age. This requires that the cluster must contain the building-block components of a cD2 galaxy. The author reports and analyzes new data which demonstrate that not a single non-cD2 galaxy is sufficiently luminous to serve as a building block of another cD2 galaxy in 85% (22 of 26) observed cD2 clusters. It follows that a missing ingredient exists in our understanding of dynamical friction in the present extragalactic context.
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