Omega Centauri is suspected of being centred on a black hole and of perhaps being the remnant of a small galaxy rather than just a globular cluster. Could someone tell me, in either case, what the the accepted view is of how the black hole got there? Was it created as the star cluster formed? By gravitational collapse? Or did it seed cluster creation somehow? Why should black holes be found at the centres of galaxies? Did dark matter play a role in decorating galaxies and possibly star clusters with central black holes?