Seyfert galaxy
Videos
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies. They have quasar-like nuclei with very high surface brightnesses whose spectra reveal strong, hi
The Circinus Galaxy, a Type II Seyfert galaxy
NGC 1068 (Messier 77), one of the first Seyfert galaxies classified
NGC 5793 is a Seyfert galaxy located over 150 million light-years away in the constellation of Libra.
Optical and ultraviolet images of the black hole in the center of NGC 4151, a Seyfert galaxy
Supermassive black hole
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A supermassive black hole is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun. Black holes are a class o
Seyfert galaxy
…are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. These galaxies have supermassive black holes at their centers which are surrounded by accretion discs of in-falling material. The accretion discs are believed to be the source of the observed…
The first direct image of a supermassive black hole, found in the galactic core of Messier 87.
An artist's conception of a supermassive black hole surrounded by an accretion disk and emitting a relativistic jet.
Artist's impression of the huge outflow ejected from the quasar SDSS J1106+1939
Artist's illustration of galaxy with jets from a supermassive black hole