AGN Obscuration and the Unified Model
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 toroida...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/782030 |
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| _version_ | 1832545734986039296 |
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| author | Stefano Bianchi Roberto Maiolino Guido Risaliti |
| author_facet | Stefano Bianchi Roberto Maiolino Guido Risaliti |
| author_sort | Stefano Bianchi |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-bc590076f9b74fd280a3e444d1cea57e |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-bc590076f9b74fd280a3e444d1cea57e2025-02-03T07:24:49ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/782030782030AGN Obscuration and the Unified ModelStefano Bianchi0Roberto Maiolino1Guido Risaliti2Dipartimento di Fisica, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Roma, ItalyINAF-Osservatorio Astronomico di Roma, Via di Frascati 33, 00040 Monte Porzio Catone, ItalyINAF-Osservatorio Astrofisico di Arcetri, L.go E. Fermi 5, Firenze, ItalyUnification 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.http://dx.doi.org/10.1155/2012/782030 |
| spellingShingle | Stefano Bianchi Roberto Maiolino Guido Risaliti AGN Obscuration and the Unified Model Advances in Astronomy |
| title | AGN Obscuration and the Unified Model |
| title_full | AGN Obscuration and the Unified Model |
| title_fullStr | AGN Obscuration and the Unified Model |
| title_full_unstemmed | AGN Obscuration and the Unified Model |
| title_short | AGN Obscuration and the Unified Model |
| title_sort | agn obscuration and the unified model |
| url | http://dx.doi.org/10.1155/2012/782030 |
| work_keys_str_mv | AT stefanobianchi agnobscurationandtheunifiedmodel AT robertomaiolino agnobscurationandtheunifiedmodel AT guidorisaliti agnobscurationandtheunifiedmodel |