The ISM properties and evolution in AGNs
Yari Juarez Lopez · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · 2009
A infrared (IR) and submillimeter/millimeter (submm/mm) study of a sample of Active Galactic Nuclei (AGNs) is presented in this thesis. The aim is to investigate the metallicity and dust evolution in these objects. The work is divided in three sections. In the first part, we investigated the metallicity of the Broad Line Region (BLR) in a sample of 27 quasars in the redshift range 46 quasars. The latter result is puzzling, since the minimum enrichment timescale of carbon is about 1 Gyr, i.e., longer than the age of the universe at z ~6.