2004/03/23 by Gary Ferland, Ferland, Gary
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0403562
Invited review at conference "AGN Physics with the Sloan Digital Sky Survey"
arxiv created 2004/03/23 · arxiv updated 2009/12/01
The spectrum emitted by the Broad Emission Line Regions of Active Galactic Nuclei can measure the luminosity of the central object and the chemical composition of the interstellar medium in a very young galaxy, and so constrain the expansion of the universe and the first stages of the evolution of massive galaxies. Here I review some recent developments in our understanding of the nature of the clouds and the interpretation of their spectra.