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Paper: The Atomic and Molecular Environments of AGN
Volume: 340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA
Page: 210
Authors: Peck, A.B.
Abstract: The unified scheme of AGN requires an obscuring region of atomic or molecular gas surrounding the central engine which effectively shields the inner few parsecs of the source from view if the radio axis lies close to the plane of the sky. There are three methods by which it is possible to detect this circumnuclear structure; atomic gas seen in absorption, molecular gas seen either masing or in absorption, and ionized gas in absorption or emission. I will attempt to summarize some of the recent observations using all 3 of these methods.
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