Multiplicity of the first brightest galaxy in a cluster versus Bautz-Morgan type
Journal Article
·
· Astrophys. J., Lett.; (United States)
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 >4 x 10/sup 9/ yr. In contrast, the theoretical time scales for merger by dynamical friction and tidal energy exchange are approx.3 x 10/sup 7/ (or 3 x 10/sup 8/) yr.
- Research Organization:
- Herzberg Institute of Astrophysics, Dominion Astrophysical Observatory
- OSTI ID:
- 6097459
- Journal Information:
- Astrophys. J., Lett.; (United States), Vol. 231:1
- Country of Publication:
- United States
- Language:
- English
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