The prevalence of narrow optical Fe II emission lines in type 1 active galactic nuclei

Xiao Bo Dong, Luis C. Ho, Jian Guo Wang, Ting Gui Wang, Huiyuan Wang, Xiaohui Fan, Hongyan Zhou

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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 Fe II-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.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume721
Issue number2 PART 2
DOIs
StatePublished - Oct 1 2010

Fingerprint

active galactic nuclei
spectral analysis
geometry
quasars
spectrum analysis
luminosity
gas
galaxies
gases

Keywords

  • Accretion, accretion disks
  • Galaxies: active
  • Line: formation
  • Line: identification
  • Quasars: emission lines
  • Radiation mechanisms: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The prevalence of narrow optical Fe II emission lines in type 1 active galactic nuclei. / Dong, Xiao Bo; Ho, Luis C.; Wang, Jian Guo; Wang, Ting Gui; Wang, Huiyuan; Fan, Xiaohui; Zhou, Hongyan.

In: Astrophysical Journal Letters, Vol. 721, No. 2 PART 2, 01.10.2010.

Research output: Contribution to journalArticle

Dong, Xiao Bo ; Ho, Luis C. ; Wang, Jian Guo ; Wang, Ting Gui ; Wang, Huiyuan ; Fan, Xiaohui ; Zhou, Hongyan. / The prevalence of narrow optical Fe II emission lines in type 1 active galactic nuclei. In: Astrophysical Journal Letters. 2010 ; Vol. 721, No. 2 PART 2.
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AU - Dong, Xiao Bo

AU - Ho, Luis C.

AU - Wang, Jian Guo

AU - Wang, Ting Gui

AU - Wang, Huiyuan

AU - Fan, Xiaohui

AU - Zhou, Hongyan

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