The Origin and Cause of Star Formation shut down in Quiescent elliptical galaxy NGC 4150 and Milky Way is:
The swift Central attraction of zero mass Herbig Haro Black Holes preferential to Fermionic based elements like plasma jets and dust globules..
Equal sized Black Holes do not, they repel each other by mutual attracted plasma tails (and jets) and form Star forming dual BH Herbig Haro systems with stars forming in the center, connected by dual plasma jets and Birkeland currents, due the special (Q-FFF- Penrose trapped space effect).Conclusion: Close to the Black Hole center of Giant Galaxies, all Herbig Haro dual massless Black Holes are more attracted (better Casimir effect) and eaten due its zero masses leaving former Fermionic mass carrying- plasma jets and Dust globules (primordial baby stars) behind. (see image Milky Way center Sag A below.)
See also: A Hubble Space Telescope image of the quiescent elliptical galaxy NGC 4150. In this star formation has essentially shut down. Credit: NASA, ESA, R.M. Crockett (University of Oxford, U.K.), S. Kaviraj (Imperial College London and University of Oxford, U.K.), J. Silk (University of Oxford), M. Mutchler (Space Telescope Science Institute, Baltimore), R. O'Connell (University of Virginia, Charlottesville), and the WFC3 Scientific Oversight Committee
Below: NGC 4150.
Equal sized Black Hole based HH systems with Plasma jets and Birkeland currents.(ion jets)
