The Prevalence of Narrow Optical Fe II Emission Lines in Type 1 Active Galactic Nuclei

1); 2); (2) Carnegie Observatories; (3) Yunnan Observatory; (4) U. of Arizona ); China; Hongyan Zhou (1) ( (1) Univ. of Sci. & Tech. of China; Huiyuan Wang (1); Jian-Guo Wang (3; Luis C. Ho (2)

The Prevalence of Narrow Optical Fe II Emission Lines in Type 1 Active Galactic Nuclei

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arxiv 1009.2209 v1 pith:XFL5KGGI submitted 2010-09-12 astro-ph.GA

Xiao-Bo Dong (1 , 2) , Luis C. Ho (2) , Jian-Guo Wang (3 , 1) , Ting-Gui Wang (1) , Huiyuan Wang (1) , Xiaohui Fan (4)

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Hongyan Zhou (1) ( (1) Univ. of Sci. & Tech. of China (2) Carnegie Observatories (3) Yunnan Observatory China (4) U. of Arizona )

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From detailed spectral analysis of a large sample of low-redshift active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey, we demonstrate---statistically for the first time---that narrow optical Fe II emission lines, both permitted and forbidden, are prevalent in type 1 AGNs. Remarkably, these optical lines are completely absent in type 2 AGNs, across a wide luminosity range, from Seyfert 2 galaxies to type 2 quasars. We suggest that the narrow FeII-emitting gas is confined to a disk-like geometry in the innermost regions of the narrow-line region on physical scales smaller than the obscuring torus.

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astro-ph.HE 2026-08 accept novelty 5.0 of 10

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