AGN Obscuration and the Unified Model

Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics

Scientific paper

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14 pages, 8 figures, review article accepted for publication on the special issue of Advances in Astronomy "Seeking for the Le

Scientific paper

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.

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