Multiplicity of the first brightest galaxy in a cluster versus Bautz-Morgan type

Details Multiplicity of the first brightest galaxy in a cluster versus Bautz-Morgan type Multiplicity of the first brightest galaxy in a cluster versus Bautz-Morgan type

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l...3r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 1, 1979, p. L3-L6. Research supported by the National Rese

Astronomy and Astrophysics

Astrophysics

22

Brightness, Galactic Clusters, Galactic Evolution, Statistical Analysis, Dynamic Characteristics, Energy Transfer, Frequency Distribution, Tables (Data)

Scientific paper

The fraction of multiple first-brightest galaxies in Bautz-Morgan type I, I-II clusters is 7 times larger than the fraction in type III clusters. Observational evidence indicates that the 23% (28 out of 112) binary first-brightest galaxies in type I clusters are physical systems, which leads to an empirical time scale for merger of less than 4 billion yr. In contrast, the theoretical time scales for merger by dynamical friction and tidal energy exchange are approximately 30 million (or 300 million) yr.

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