NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T22:11:31 PDT
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For refcode 1998PASJ...50...31N:
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NED Abstract

Copyright by Astronomical Society of Japan. 1998PASJ...50...31N A Geometrical Relationship between Broad-Line Clouds and an Accretion Disk around Active Galactic Nuclei Shingo NISHIURA, Takashi MURAYAMA, and Yoshiaki TANIGUCHI Astronomical Institute, Tohoku University, Aoba, Sendai, Miyagi 980-77 E-mail(S.N.): nishiura@astr.tohoku.ac.jp (Received 1997 September 16; accepted 1997 December 17) 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 he 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. Key words: Galaxies: active - Galaxies: nuclei - Galaxies: X-rays
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