A geometrical relationship between broad-line clouds and an accretion disk around active galactic nuclei

Shingo Nishiura, Takashi Murayama, Yoshiaki Taniguchi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Recent hard X-ray spectroscopy of active galactic nuclei has strongly suggested that double-peaked, very broad Fe K emission arises from an accretion disk around the central engine. Model fitting of the observed Fe K emission line profile makes it possible to estimate a probable inclination angle of the accretion disk. In order to study the geometrical relationship between the accretion disk and broad emission-line regions (BLRs), we investigate the correlation between the inclination angle of the accretion disk and the velocity width of BLRs for 18 type-1 Seyfert galaxies. We found that there may be a negative correlation between them, i.e., Seyfert nuclei with a more face-on accretion disk tend to have larger BLR velocity widths, suggesting that the BLRs are not coplanar with respect to the accretion disk. The most probable interpretation may be that the BLRs arise from outer parts (r ∼ 0.01 pc) of a warped accretion disk illuminated by the central engine.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalPublications of the Astronomical Society of Japan
Volume50
Issue number1
DOIs
Publication statusPublished - 1998

Keywords

  • Galaxies: Active
  • Galaxies: Nuclei
  • Galaxies: X-rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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