Answer to Question #88418 in Astronomy | Astrophysics for Shivam Nishad

Question

Define an active galaxy. What is the source of its activity?

Answer 1

A galaxy hosting an active galactic nucleus is called an "active galaxy". An active galactic nucleus is a compact region at the center of a galaxy that has a much higher than normal luminosity. The radiation from an active galactic nucleus is believed to result from the accretion of matter by a supermassive black hole at the center of its host galaxy.