Warped discs and the Unified Scheme

Details Warped discs and the Unified Scheme Warped discs and the Unified Scheme

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..117l&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Physics

1

Scientific paper

The standard Unified Scheme for AGN involves obscuration by a geometrically thick "molecular torus" with an opening angle of around 30 degrees. This simple picture seems physically implausible, fails to explain several facts about Type I and Type II AGN, and leaves key features such as the height of the torus or the spectrum of the dust as arbitrary details. Warped disks have been suggested in the past as a more physically plausible alternative for making a geometrically thick obscuring structure. I will show that a simple variant of this idea quite naturally explains the ratio of Type II to Type I AGN, their different OIII strengths, the average size of the IR bump compared to the the UV bump, and the typical temperature of the radiating dust. A physical model which corresponds to this simple recipe is likely to involve a strongly magnetised disc over a large scale range.

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