The dynamical interaction of AGN with their galaxian environments |
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Authors: | Michael A Dopita |
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Institution: | (1) Research School of Astronomy & Astrophysics, The Australian National University, Canada |
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Abstract: | 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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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