期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 683, 期 2, 页码 L115-L118出版社
IOP PUBLISHING LTD
DOI: 10.1086/591848
关键词
galaxies : nuclei; galaxies : Seyfert; line : profiles; quasars : emission lines; quasars : general
资金
- IHEP AGN
- NSFC [NSFC-10325313, 10733010, 10521001]
- CAS [KJCX2-YW-T03]
We report on a systematic investigation of the H beta and Fe II emission lines in a sample of 568 quasars within z < 0.8 selected from the Sloan Digital Sky Survey. The conventional broad H beta emission line can be decomposed into two components-one with intermediate velocity width and another with very broad width. The velocity shift and equivalent width of the intermediate-width component do not correlate with those of the very broad component of H beta but its velocity shift and width do resemble Fe II. Moreover, the width of the very broad component is roughly 2.5 times that of the intermediate-width component. These characteristics strongly suggest the existence of an intermediate-line region, whose kinematics seem to be dominated by infall, located at the outer portion of the broad-line region.
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