see: https://www.sciencedaily.com/releases/2018/10/181002103000.htm
see also for "the origin of dead galaxies": http://vixra.org/pdf/1706.0490v2.pdf
General reference on Electric Dark Matter Black Holes: http://vixra.org/author/leo_vuyk
Abstract,
The origin of “dead” galaxies according to Quantum FFF Theory, is assumed to be based on very stable external dark matter black hole configuration with a growing internal central dark matter black hole, growing by smaller super nova black hole mergers (not by Fermion merger mass) and absence of neighboring galaxy merger potential.
According to Quantum FFF Theory, early Galaxies have growing potential by the number and size of external primordial dark matter black holes initially formed as big bang splinters able to pair into Quasars with stars-galaxies in between the dual black hole hotspots, called Galaxy Anchor Black Holes ( GABHs) which can merge with other galaxy-systems into complex spirals and elliptical.
Irregular galaxies and Dwarf galaxies are supposed to be the result of secondary star forming interaction between GABHs after a merging process..
Later after Supernova black hole production these smaller black holes are able to pair as hotspots or “bow shocks” into Herbig Haro open star cluster systems,.
If no galaxy merger candidates are available in the neighborhood, the galaxy will soon reach a maximum size and die. Some Elliptic galaxies die also by reaching maximum merger potential.
Also according to Quantum FFF ( Function Follows Form) Theory, all star forming molecular clouds are the result of one or more Herbig Haro systems, equipped with so called dual hotspots which are assumed to be the result of dual new physics “electric dark matter black holes” in contrast with general accepted black hole theories.