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A Relation between the Mid-Infrared [Ne v] 14.3 Micrometers and [Ne III] 15.6 Micrometer Lines in Active Galactic NucleiWe present a strong correlation between the [Ne v] 14.3 mm and [Ne III] 15.6 mm emission lines arising from the narrow-line regions (NLRs) of active galactic nuclei (AGNs), spanning 4 orders of magnitude in luminosity. The data are compiled primarily from Spitzer Space Telescope observations of nearby Seyfert galaxies (median z p 0.01) and 3C radio sources (median z p 0.52). This correlation is consistent with earlier studies in the optical/UV bands showing that line ratios arising in the NLRs are remarkably constant across AGNs. We also show that the correlation allows only a very narrow range in ionization parameter for simple photoionization models. The observed correlation will place tight constraints on alternative models, which predict constant line ratios over a broader range in ionization parameter.
Document ID
20070032971
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gorjian, V.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Cleary, K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Werner, M. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lawrence, C. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 23, 2013
Publication Date
January 18, 2007
Publication Information
Publication: The Astrophysical Journal Letters
Publisher: American Astronomical Society
Volume: 655
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other
Keywords
emission lines
formation
Seyfert galaxies
quasars
active galaxies

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