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Date and Time of the Query: 2019-04-26 T07:36:50 PDT
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For refcode 2007ApJ...655L..73G:
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2007ApJ...655L..73G A Relation between the Mid-Infrared [Ne v] 14.3 micron and [Ne III] 15.6 micron Lines in Active Galactic Nuclei V. Gorjian, K. Cleary, M. W. Werner, and C. R. Lawrence Abstract. We present a strong correlation between the [Ne v] 14.3 micron and [Ne III] 15.6 micron 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=0.01) and 3C radio sources (median z=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. Key words: Galaxies: Active, Galaxies: ISM, Galaxies: Nuclei, Galaxies: Seyfert, Line: Formation, Galaxies: Quasars: Emission Lines
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