- Type of galaxy with bright cores and known to emit X-rays. Seyferts are disrupted spiral galaxies and are related to quasars and BL Lacertae objects, although their activity is on a less massive scale. They were discovered by Carl Seyfert in 1943. It seems that many large spiral galaxies may have a Seyfert stage, and that our own galaxy may once have been a Seyfert. The Seyfert process may be related to material being sucked into black holes at the hearts of galaxies, and our galaxy appears to contain a massive black hole at its centre.
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