Emission-Line Probes of Circumnuclear Dust in AGNs

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dc.creatorShields, Joseph C.
dc.creatorPogge, Richard W.
dc.creatorDe Robertis, Michael M.
dc.date1998-09-20
dc.date.accessioned2026-07-07T02:27:59Z
dc.date.available2026-07-07T02:27:59Z
dc.descriptionEmission lines that trace elements subject to strong depletion onto grains provide a means for probing the dust content of AGNs. Examples include infrared [FeII] and optical [CaII] lines. The excitation mechanisms underlying the [FeII] lines remain controversial, resulting in related disagreement over the gas-phase abundance of iron in Seyfert narrow-line regions. In this contribution we emphasize the utility of the [CaII] lines as a consistency test for claims of grain destruction affecting the [FeII] lines. A search for [CaII] emission in NGC 1068 at a location of strongest [FeII] emission along the radio jet yields a strong upper limit, but no detection. This result suggests that grains survive largely intact in a region that otherwise shows strong evidence of shock processing.
dc.description6 pages (LaTeX, paspconf.sty), 1 postscript figure, to appear in proceedings of "Structure and Kinematics of Quasar Broad Line Regions" (1998 March 23-26, Lincoln, Nebraska), eds. C.M. Gaskell et al
dc.identifierhttps://arxiv.org/abs/astro-ph/9809247
dc.identifierhttp://arxiv.org/abs/astro-ph/9809247
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12930
dc.subjectAstrophysics
dc.titleEmission-Line Probes of Circumnuclear Dust in AGNs
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