Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714213k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.13; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a study of reddening and absorption towards the Narrow Line Regions (NLR) in active galactic nuclei (AGN) selected from the Revised Shapley-Ames, 12mu, and Swift/Burst Alert Telescope samples. For the sources in host galaxies with inclinations of b/a > 0.5, we find that mean ratio of [O III] 5007 and [O IV] 28.59mu, is more than a factor of 2 lower in Seyfert 2s than Seyfert 1s. The combination of low [O III]/[O IV] and low [O III] 4363/5007 ratios in Seyfert 2s suggests more extinction of emission from the inner NLR than in Seyfert 1s. Similar column densities of dusty gas can account for the suppression of both [O III] 5007 and [O III] 4363. Also, we find that the X-ray line O VII 22.1A is weaker in Seyfert 2s, consistent with absorption by the same gas that reddens the optical emission. If Seyfert 2 galaxies have similar intrinsic [O III] spatial profiles as Seyfert 1s, the external dusty gas must extend far out along the NLR and, perhaps in the form of nuclear dust spirals.
Crenshaw Michael
Guainazzi Matteo
Kraemer Steven B.
Mélendez Marcio
Mushotzky Richard
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