I provide a short review of the properties of Narrow-line Seyfert 1 (NLS1) galaxies across the electromagnetic spectrum and of the models to explain them. Their continuum and emission-line properties manifest one extreme form of Seyfert activity. As such, NLS1 galaxies may hold important clues to the key parameters that drive nuclear activity. Their high accretion rates close to the Eddington rate provide new insight into accretion physics, their low black hole masses and perhaps young ages allow us to address issues of black hole growth, their strong optical Fe II emission places strong constraints on Fe II and perhaps metal formation models and physical conditions in these emission-line clouds, and their enhanced radio quiteness permits a fresh look at causes of radio loudness and the radio-loud radio-quiet bimodality in AGN.
Revista Mexicana de Astronomia y Astrofisica Conference Series
- Pub Date:
- April 2008
- galaxies: active;
- galaxies: Seyfert;
- To appear in the proceedings of "The nuclear region, host galaxy and environment of AGN", E. Benitez, I. Cruz-Gonzalez &