DEAD GALAXIES: By the disappearence (eating) of Herbig Haro black holes,( DUAL star forming black holes) eaten from the intruder black holes of smaller merging intruder galaxies.
Conclusion :according to Q-FFF Theory, The dual starforming Herbig Haro systems ( black Holes with equal size) of intruder galaxies are discupted and partly eaten by bigger ones of the "larger mother galaxy"Below: the university of Waterloo (CA) research on Dear Galaxies. se also: https://bigthink.com/starts-with-a-bang/star-formation-great-galactic-genocide/?fbclid=IwAR0eaxg58mwCpvQft7TjpN0WlzmJxS5A44M5c8UJlp-Ol1uk2PRtQkxt3Vk
and:
Below is an example cartoon of external Galaxy black holes eating other smaller BHs of smalle merging galaxies and forming new Herbig haro systems for new "lonely Galaxies" of gas without much stars.
