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Seyfert galaxy
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Class of active galaxies with very bright nuclei
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Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies. They have quasar-like nuclei (very luminous sources of electromagnetic radiation that are outside of our own galaxy) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, their...

Instance of
astronomical object type
Subclass of
Galaxy
Active galactic nucleus
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