Active Galactic Nuclei and Quasars!

Some galaxies have cores that outshine the entire rest of the galaxy. What are these amazing phenomena, and how do they manifest? This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Active galactic nucleus: en.wikipedia.o...
Quasar: en.wikipedia.o...
Messier 87: en.wikipedia.o...
Gamma Rays in Active Galactic Nuclei: svs.gsfc.nasa....
Bremsstrahlung X-Rays: hyperphysics.ph...
Synchrotron Radiation: hyperphysics.ph...
Synchrotron Radiation: en.wikipedia.o...