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What is a Seyfert galaxy?
Are Seyfert galaxies quasars?
Are Seyfert galaxies like the Milky Way?
How do Seyfert galaxies work?
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies.
Seyfert galaxy, any of a class of galaxies known to have active nuclei. Such galaxies were named for the American astronomer Carl K. Seyfert, who first called attention to them in 1944. Two types are recognized.
Apr 1, 2024 · Seyfert Galaxies are a type of spiral galaxy that is characterized by extremely bright nuclei. They were first identified by astronomer Carl Seyfert in the 1940s, hence the name. These galaxies are known for their active galactic nuclei (AGN), which emit large amounts of energy across the electromagnetic spectrum, from radio waves to X-rays.
Seyfert Galaxies. Seyfert galaxies are lower-luminosity active galactic nuclei, with M > -21.51 + 5 log h0 for the active nucleus the generally accepted criterion, due originally to Schmidt & Green (1983), for distinguishing Seyfert galaxies from quasars.
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Mar 18, 2008 · Seyfert galaxies are quite similar to normal galaxies like our own Milky Way except in one critical respect: their nuclei are fantastically bright -- in some instances as luminous as 100 billion suns. By contrast, the center of the Milky Way shines like about ten million suns.
Powered by a black hole munching on material at the centre of their galactic structure, Seyfert galaxies are highly energetic and have bright compact cores, which spit out lots of strong infrared emission. They come in two types – type I and type II, with the former possessing faster-moving hot gas than the latter.
