Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914905l&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.05; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a strong correlation between the [NeV] λ14.3μm and [NeIII] λ15.6μm emission lines arising from the Narrow Line Regions (NLR) of Active Galactic Nuclei (AGN), spanning four 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 NLR are remarkably constant across AGN. 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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