https://www.eso.org/public/news/eso1725/
A long-standing question is why only a small fraction of supermassive black holes at the centres of galaxies are active. Supermassive black holes are present in almost all galaxies, so why are only a few accreting matter and shining brightly? These results reveal a previously unknown mechanism by which the black holes can be fed.
General thinking seems to be that the AGN is the cause and the activity in the galaxy is the effect. To me it was more obvious that AGNs are due to matter events in galaxies. What do you think?
An AGN is a compact region at the center of a galaxy, more luminous than the surrounding galaxy light. They are very energetic due either to the presence of a black hole or star formation activity at the core of the galaxy. So, I think that AGN because of galactic activities.
It's against the mainstream, but there is a reason why the strength of gravity might decrease for masses with mass/radius ratio approaching c^2/G. If incoming matter approaching the centre of a galaxy reaches this limit the gravity reduces and the pressure forces an ejection perpendicular to the disc.
http://vixra.org/abs/1802.0167 Appendix B3. After the ejection the mass/radius ratio is reduced and so the ejections only happen periodically, that's why only a few galaxies appear to have AGNs.
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