Seyfert Galaxy - MSN Encarta

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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 Galaxies
Galaxy, NGC/IC Identification of the galaxy with other identification and NGC/IC number Type Seyfert type (1, 2); "--" indicates that these are no more classified as Seyfert ...
Seyfert Galaxies
Below 1200 Å, a region in which no Seyfert galaxy has previously been observed, we find strong emission in the OVI doublet and a very complex absorption-line spectrum.

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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.