Image source: NASA
Quasar (Quasi Stellar Astronomical Radio source): very intense sources of electromagnetic radiation with a large redshift, which means that they are at a great distance. Name that has been improperly for being much more than a star.
Being the emergent radiation of the poles of a supermassive black hole like those that are in the center of many, if not all, active galaxies (precisely they are called active when this radiation is emitted), what is intuited that happens, Is that the black holes of two active galaxies are fused in one, not as a collision of objects directed against each other, but by rotation increasingly tight and accelerated, so that it may be assumed that for a short time power will increase Of radio emission, to be interrupted when the materials that caused its emission by changing its trajectories around each one by new trajectories can in fact interrupt those emissions, this time around the center of mass of both holes.
Once the two holes have been melted in one, with the consequent emission of energy of all kinds from the gravitational to e-m, it is possible that all the materials that have not been dispersed from the surroundings of the resulting black hole, are reorganized so that it can return to To emit again the radiation in which it gave them name before, in greater quantity than each one or less that its emissions separately, and also it is possible that it ceases definitively or ceases to be appreciable from the places in which it was detected for having changed his address, And the amount and brightness of matter illuminated by radiation.
More details here the link: Quasar
Nice to see posts about science -in this case astrophysics- here.
It is always good to learn a little of everything :)