What is AGN in astronomy? An active galactic nucleus (AGN) is a small region at the centre of some galaxies that is far brighter than can be explained by the stellar population alone. The extremely luminous central region is emitting so much radiation that it can outshine the rest of the galaxy altogether.
Is an AGN a black hole? Based on extensive evidence, active galactic nuclei, also commonly referred to as AGN, are now understood to be active supermassive black holes at the center of galaxies that are emitting jets and winds.
What is the difference between a quasar and an AGN? All quasars are AGN, but not all AGN are quasars. AGN is a terminology that comes later than quasars. Quasars is the term applied at the beginning, when the first objects of this type have been discovered. They were radio-loud and point-like (the so-called quasi-stellar radio sources).
Is the Milky Way an AGN? The center of such an eventful galaxy is called an active galactic nucleus, or AGN. Our own Milky Way seems to have a relatively calm center, but astronomers suspect this wasn’t always the case. Some clues suggest that a flare of energetic radiation burst from our galaxy’s center within the last few million years.