Ionized gas in active galactic nuclei

Hagai Netzer*

*Corresponding author for this work

Research output: Contribution to journalShort surveypeer-review

31 Scopus citations


This review gives an introduction to the physics of ionized gas in active galactic nuclei (AGN). The main topics are: Definition of the AGN phenomenon, methods for discovering AGN, basic AGN observations, photoionization and recombination of low density plasma, energy balance and gas temperature, the spectrum of ionized gas, dust and reddening, the motion of ionized gas under the influence of strong radiation fields, the broad line region (BLR), the narrow line region (NLR), and the highly ionized outflowing gas in AGN.

Original languageEnglish
Pages (from-to)257-273
Number of pages17
JournalNew Astronomy Reviews
Issue number6
StatePublished - Aug 2008


  • Broad line region
  • Collisions
  • Emission lines
  • Highly ionized gas
  • Ionization
  • Ionized gas
  • Narrow line region
  • Optical depth
  • Recombination


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