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2007ApJ...655L..73G - Astrophys. J., 655, L73-L76 (2007/February-1)

A relation between the mid-infrared [Ne V] 14.3 µm and [Ne III] 15.6 µm lines in active galactic nuclei.


Abstract (from CDS):

We present a strong correlation between the [Ne V] 14.3 µm and [Ne III] 15.6 µm 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: ISM - Galaxies: Nuclei - Galaxies: Seyfert - Line: Formation - Galaxies: Quasars: Emission Lines

Simbad objects: 51

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