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

8 Scopus citations

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)
Pages (from-to)L143-L147
JournalAstrophysical Journal Letters
Volume721
Issue number2 PART 2
DOIs
StatePublished - Oct 1 2010

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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