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Mid-Infrared Forbidden Lines of NGC 1068, NGC 4151, and NGC 5506

Published online by Cambridge University Press:  12 April 2016

M.A. Greenhouse ,
T.L. Hayward ,
S. Satyapal ,
D.H. Wooden ,
J.W. Miles ,
F.C. Witteborn ,
J.D. Bregman ,
C.E. Woodward ,
M.A. Malkan  and
J. Fischer
...Show all authors
M.A. Greenhouse
Affiliation:
National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA
T.L. Hayward
Affiliation:
Department of Astronomy, Cornell University, Ithaca, NY 14853-6801, USA
S. Satyapal
Affiliation:
National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA
D.H. Wooden
Affiliation:
Space Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
J.W. Miles
Affiliation:
National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA
F.C. Witteborn
Affiliation:
Space Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
J.D. Bregman
Affiliation:
Space Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
C.E. Woodward
Affiliation:
Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USA
M.A. Malkan
Affiliation:
Department of Astronomy, University of California, Los Angeles, CA 90024, USA
J. Fischer
Affiliation:
Remote Sensing Division, Naval Research Laboratory, Washington, DC 20375, USA
H.A. Smith
Affiliation:
National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA

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We report near-infrared spectroscopy of three Seyfert galaxies. Velocity resolved spectra covering low excitation-potential transitions of [Ar III] 8.991 µm, [S IV] 10.514 µm, and [Ne II] 12.813 µm were obtained using the facility mid-infrared array spectrometer (SpectroCam) of the Palomar Observatory Hale 5-m Telescope, and low-resolution spectra covering [Mg V] 5.608 µm, [Ar II] 6.985 µm, and [Ne VI] 7.642 µm were obtained using the faint-object spectrograph (HIFOGS) of the Kuiper Airborne Observatory (KAO).

We find high contrast [Ar III] and [S IV] in each galaxy, and [Ne II] in NGC 1068 and NGC 4151 (12.8 µm data were not obtained on NGC 5506). The line profiles are well resolved. In NGC 1068 and NGC 4151, they are fit by singlecomponent Gaussians. However, in NGC 5506, evidence for a broad pedestal is seen in the [Ar III] and [S IV] spectra, similar to the broad Paβ component reported by Blanco et al. (1990) and Rix et al. (1990).

Type
VI. The Narrow-Line Regions and Beyond
Information
International Astronomical Union Colloquium , Volume 159: Emission Lines in Active Galaxies: New Methods and Techniques , 1997 , pp. 308 - 309
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

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Rix, H.W., et al. 1990, ApJ, 363, 480.Google Scholar
Spinoglio, L., & Malkan, M.A. 1992, ApJ, 318, 370.Google Scholar