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. Almost all Seyferts are spiral galaxies. They seem to be closely related to quasars, but are about 100 times fainter. They are named after their discoverer, US astronomer Carl Seyfert.
© RM 2012. Helicon Publishing is division of RM.
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