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A portion of the galaxies we can observe are classified as active. That is, a significant portion of the total energy output from the galaxy is emitted by a source other than the stars, dust and interstellar medium. The standard modél for such active galactic nucleus is based upon energy generation from matter falling into a supermassive black hole at the core region.

Galaxies that emit high-energy radiation in the form of x-rays are classified as Seyfert galaxies, quasars and blazars. Active galaxies that emit radio frequencies from relativistic jets erupting from the core are classified as Radio galaxies. A unified modél of these types of active galaxies explains their differences based on the viewing angle of the observer.