Jun 06, 2014
Dragana Ilic, Department of Astronomy, Faculty of Mathematics, University of Belgrade
"Emission lines: a window into the heart of AGN"
In spite of many papers being devoted to the physical properties (physics and geometry) of the broad line region (BLR) in active galactic nuclei (AGN), the true nature of the BLR is not well known. The BLR is close to the supermassive black hole (SMBH) in the center of an AGN and may hold basic information about the formation and fueling of AGN. For example, the mass of the SMBH can be derived from the dynamics of the BLR gas that is gravitationally bound to an SMBH. The broad emission lines are the only signatures of the BLR. They often show very complex line profiles, usually strongly variable in time. Their fluxes and profiles can give us the information about the geometry and physics of the BLR. Here we will summarize some tools and techniques for studying the properties of the SMBH and the surrounding BLR gas using the broad emission lines properties and their variability.