2002/08/23 by Michael A. Dopita, M. A. Dopita
Physics and Astronomy · #Active galactic nucleus #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Cosmology #Excitation #Galaxies: Formation, Evolution, Phenomena #Photon #Shock (circulatory) #Shock wave #astro-ph
paper · pdf · doi:10.1023/a:1024049805094
published as Astrophys.SpaceSci.284:569-572,2003 · 4 pages, TeX (or Latex, etc), to appear in The Evolution of Galaxies III - From Simple Approaches to Self-Consistent Models, Eds. G. Hensler, G. Stasinska, S. Harfst, P.Kroupa & Chr. Theis, Astrophysics & Space Science, (in press)
arxiv created 2002/08/23 · openalex publication_date 2003/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Jet-driven shocks are responsible for an important fraction of the emission of the narrow-line regions (NLRs) in many classes of AGN. However, this cannot explain all observations. It is clear that the remaining sources are photoionised by the active nucleus. The 2-d hydrodynamic models from the RSAA group support an evolutionary scenario whereby the shock-excited NLRs are initially jet-driven but later, ionizing photons from the central engine replace shocks as the main excitation mechanism and shock induced star formation may also become important. In their photoionized phase, dusty and radiation-pressure dominated evolution produces a self-regulated NLR spectrum. This model aso explains the coronal emission lines and fast (3000 km s-1) outflows seen in some Seyferts.