Detection of Faint BLR Components in the Starburst/Seyfert Galaxy NGC 6221 and Measure of the Central BH Mass
Although the numbers of known quasars and active galactic nuclei (AGN) have grown considerably in the past decade, a vast amount of discovery space remains to be explored with much larger and deeper samples. LSST will revolutionize our understanding of the growth of supermassive black holes with cosmic time, AGN fueling mechanisms, the detailed physics of accretion disks, the contribution of AGN feedback to galaxy evolution, the cosmic dark ages, and gravitational lensing. The evolution of galaxies is intimately tied with the growth and energy output from the supermassive black holes which lie in the centers of galaxies. The observed correlation between black hole masses and the velocity dispersion and stellar mass of galaxy bulges seen at low redshift (Tremaine et al. 2002), and the theoretical modeling that suggests that feedback from AGN regulates star formation, tell us that AGN play a key role in galaxy evolution.