Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-31
Astronomy and Astrophysics
Astrophysics
10 pages, Invited talk at the conference X-ray Astronomy '999: Stellar Endpoints, AGNs and the Diffuse X-ray Background
Scientific paper
10.1063/1.1434633
The properties of the absorption in type 2, narrow line AGNs are reviewed by focusing on the X-ray indicators. I discuss the properties of the cold absorbing medium (the putative torus) and of the reprocessed components, as well as their implications for the unified model. The relation between optical classification and X-ray absorption is examined. The case of "fossil" AGNs, whose type 2 classification is not due to absorption effects, is also discussed. Although this review is mainly focused on nearby Seyfert 2 galaxies, I also shortly discuss the effects of absorption at higher luminosities and higher redshift and the implications for the X-ray background.
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