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Narrow‐line Seyfert 1 (NLS1) galaxies show extreme properties with respect to the other Seyfert galaxies. Indeed, they are thought to be accreting at Eddington rates and to possess low‐mass black holes. Therefore, they may represent a key class of objects for understanding the co‐evolution of black holes and their host galaxies. We propose that NLS1s represent a class of active galactic nucleus in...
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