Comparison between long distance paired galaxy merger dark matter based Galaxy Anchor Black Holes (GABHs) and short distance dark matter Cepheids proposed to be the result of paired primordial Stellar Anchor Black holes (or Herbig Haro bowshocks) without a galaxy merging function.
see also: https://www.flickr.com/photos/93308747@N05/24551977342/in/photostream