Near-infrared spectra of Seyfert nuclei. I - The reddening problem

Citations Over TimeTop 18% of 1987 papers

Abstract

IR emission-line fluxes of various species from recent J and H band observations of five active galactic nuclei are given. These include a quasar and a Seyfert type 1, 1.5, 1.9, and 2. The infrared-to-optical ratios are used to derive the reddening appropriate to the regions emitting the broad and narrow emission lines, and comparison is made with other methods. The line ratio He II 3203 A to He II of 1.0123 microns is proposed as a useful new reddening diagnostic and is used to determine the A(v) in NGC 1068 and NGC 4151. The broad line extinction in NGC 2992 is inferred for the first time, and considered in relation to its X-ray properties.

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