Properties of the circumnuclear medium in Active Galactic Nuclei

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dc.creatorGilli, R.
dc.creatorRisaliti, G.
dc.creatorSevergnini, P.
dc.creatorMaiolino, R.
dc.creatorMarconi, A.
dc.creatorSalvati, M.
dc.date2001-03-05
dc.date.accessioned2026-07-07T01:57:53Z
dc.date.available2026-07-07T01:57:53Z
dc.descriptionWe propose a classification scheme for the circumnuclear medium of AGNs based on their location in the A_V - N_H plane (related to dust absorption and gas absorption, respectively). We present evidence that the A_V/N_H ratio is often lower than the Galactic value. This is shown by the broad line ratios of a sample of intermediate Seyferts, and by the optical/X-ray ratio of line selected (as opposed to color selected) AGNs. We point out the implications for the physical properties of the absorber. A complete classification would require a third axis, related to the density of the absorber and/or its distance from the AGN.
dc.description6 LaTeX pages including 5 postscript figures; to appear in the Proceedings of ``X-ray Astronomy 2000'', R. Giacconi, L. Stella & S. Serio Eds., ASP Conf. Series
dc.identifierhttps://arxiv.org/abs/astro-ph/0103077
dc.identifierhttp://arxiv.org/abs/astro-ph/0103077
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2560
dc.subjectAstrophysics
dc.titleProperties of the circumnuclear medium in Active Galactic Nuclei
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