•Kormendy
(1982) distinguishes these from being merely giant
ellipticals.
–Extensive
stellar envelope up to 100 kpc
–Only
in regions of enhanced galaxy density (a factor of 100
denser than the average)
–Mutiple
nuclei in 25-50% of cDs (a very rare thing)
•
•Regular
cD clusters are systems that have relaxed into dynamical
equilibirum.
–
–