Rich wrote:
It may be true for some types of galaxies (hypothetically, I'm not saying
it is), but it's clearly not true for irregulars or globular clusters.


The case for there being a strong connection betwen galaxy formation
and black holes seems to be growing.
Here's a "popular" report:
http://www.space.com/scienceastronom..._030128-1.html

It's possible that globular clusters might contain lower mass black
holes. There were some reports of the detection of a black hole in
M15. e.g. press release at:
http://www-int.stsci.edu/~marel/m15release.html

However, this claim was later retracted.