Seyfert Galaxy - MSN Encarta

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Seyfert galaxy
Galaxy in which there is a small, bright centre, caused by hot gas moving at high speed around a massive central object, possibly a black hole
Seyfert galaxy - Wikipedia, the free encyclopedia
Seyfert galaxies are a class of galaxies with nuclei that produce spectral line emission from highly ionized gas [1], named after Carl Keenan Seyfert, the astronomer who first ...
Seyfert galaxy - Hutchinson encyclopedia article about Seyfert galaxy
Seyfert galaxy. Galaxy in which there is a small, bright centre, caused by hot gas moving at high speed around a massive central object, possibly a black hole.

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Seyfert Galaxy, type of active galaxy with an extremely brilliant nucleus that emits radio waves at a rate between that of normal galaxies and that of radio galaxies. Some also emit X-rays strongly. The first Seyfert galaxy was observed in 1943 and named after its discoverer, the American astronomer Carl Seyfert; perhaps two per cent of all galaxies are of this type. Current theory suggests that Seyferts, radio galaxies, and quasars are closely related structures.