AGN obscuration and the unified model
Advances in Astronomy
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Bianchi, S., Maiolino, R., & Risaliti, G. (2012). AGN obscuration and the unified model. Advances in Astronomy https://doi.org/10.1155/2012/782030
Unification Models of Active Galactic Nuclei postulate that all the observed differences between Type 1 and Type 2 objects are due to orientation effects with respect to the line-of-sight to the observer. The key ingredient of these models is the obscuring medium, historically envisaged as a toroidal structure on a parsec scale. However, many results obtained in the last few years are clearly showing the need for a more complex geometrical distribution of the absorbing media. In this paper we review the various pieces of evidence for obscuring media on different scales, from the vicinity of the black hole to the host galaxy, in order to picture an updated unification scenario explaining the complex observed phenomenology. We conclude by mentioning some of the open issues.
External DOI: https://doi.org/10.1155/2012/782030
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267590
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Rights Holder: Copyright © 2012 Stefano Bianchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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