For UDGs see also: https://en.wikipedia.org/wiki/Ultra_diffuse_galaxy called: Ultra Diffuse Glaxies.
Below, we observe two white elliptical blobs, assumed to repesent two "Anchor Black Holes", locataed at each point of the elliptical (football) BAR star system , assumed to be the origin of tha original disc system, between the two anchor black holes. conclusion we observe a combined chaotic Mini Black hole system as the origin of the Diffuse Galaxy system.
However, ruining the elliptical system, (below) (footballsystem) to become an Ultra Diffuse system by multiple perpendicular located elliptical Anchor black holes shown as white elliptical/ round- dots. around the minor axis of the disc s haped temporary starsystem perpendicular to the main anchor axis of the disc...
See below the white dots and black dots inside the first two images.
However, if there are more than 2 Anchor Galaxy - Anchor- Black- Holes, (GABHs)