Ionized Gas in Active Galactic Nuclei
Hagai Netzer

The lectures will include a description of all important processes related to
the interaction between the strong radiation field produced by AGN and the
surrounding gas. Depending on the gas location and density, such an interaction
produces several distinct regions with well characterized spectral signatures.
The main emphasis will be on the physics of photoionized gas and the emission
and absorption processes in three regions: the broad line region (BLR), the
narrow line region (NLR) and the highly ionized gas (HIG).