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Ron, Most interesting.
How liberally is the word "galaxy" being used here? There is no suggestion that a dark matter galaxy would consist of something analagous to stars.
The implications of the existence of a small dark matter galaxy are enormous.
It is assumed that dark matter interacts only weakly with other matter and primarily through gravitational forces due to mass. So does dark matter exhibit similar gravitational organisation (e.g. core and disk or elliptical shape) to a normal rotating galaxy? How much influence would several of these dark matter galaxies have on the structure of a "hosting" normal galaxy in proximity?
If there is so much dark matter then one would think that there would have to be dark matter super-sized galaxies far bigger than the Milky Way.
Regards, Rob
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