出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Narrow-Line Seyfert 1 (NLS1) galaxies are a class of active galactic nuclei (AGN) that have all the properties of type 1 Seyfert galaxies but show peculiar characteristics in the optical (narrowest Balmer lines and strongest FeII emission) and in the X-rays. Recently, we have also discovered that the detection rate of water maser emission in NLS1 is surprisingly high, much higher than typically found in type 1 AGN and similar to that of Seyfert 2 galaxies. In this talk, we shed light on this unexpected result in the framework of the unified model for AGN. In particular, we introduce the case of the recently-discovered INTEGRAL source IGR J16385-2057, classified as a NLS1 galaxy and characterized by an unusual radio continuum and maser emission.
