Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...655l..73g&link_type=abstract
The Astrophysical Journal, Volume 655, Issue 2, pp. L73-L76.
Astronomy and Astrophysics
Astronomy
21
Galaxies: Active, Galaxies: Ism, Galaxies: Nuclei, Galaxies: Seyfert, Line: Formation, Galaxies: Quasars: Emission Lines
Scientific paper
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.
Cleary Kieran
Gorjian Varoujan
Lawrence Charles R.
Werner Michael W.
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