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

Journal Article · Fri May 01 00:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165186· OSTI ID:6019501

Ward, M J; Geballe, T; Smith, M; Wade, R; Williams, P

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 2922 is inferred for the first time, and considered in relation to its X-ray properties. 45 references.

• Research Organization: Cambridge Univ., England; Washington Univ., Seattle; Royal Observatory, Edinburgh, Scotland; Edinburgh Royal Observatory, England
• OSTI ID: 6019501
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 316; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELLIPTICAL CONFIGURATION
GALAXIES
GALAXY NUCLEI
INFRARED RADIATION
INFRARED SPECTRA
IONIZING RADIATIONS
NEAR INFRARED RADIATION
QUASARS
RADIATIONS
SEYFERT GALAXIES
SPECTRA
VISIBLE SPECTRA
X RADIATION