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Journal article
Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
The Astronomical journal, v 124(1), pp 1-17
09 Apr 2002
Abstract
Astron.J. 124 (2002) 1 Using a sample of 3814 quasars from the Sloan Digital Sky Survey, we confirm
that high-ionization, broad, emission lines such as CIV are significantly
blueshifted with respect to low-ionization, broad, emission lines such as MgII.
CIV emission line peaks have a range of shifts from a redshift of 500 km/s to
blueshifts well in excess of 2000 km/s as compared to MgII. We confirm previous
results that suggest an anti-correlation between the shift of the CIV emission
line peak and the rest equivalent width of the CIV emission line. Furthermore,
using composite spectra, we are able to show that the apparent shift of the CIV
emission line peak is not a shift so much as it is a lack of flux in the red
wing for the composite with the largest apparent shift. This observation should
strongly constrain models for the broad emission line region in quasars. The
emission line blueshift and equivalent width of CIV are also discussed in light
of the Baldwin Effect and as a function of other quasar properties such as
spectral index, radio and X-ray detection. We find a possible correlation with
both the radio and broad absorption line properties of the quasars that is
suggestive of orientation as the cause of the CIV velocity shifts.
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Details
- Title
- Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
- Creators
- Gordon T Richards - Pennsylvania State UniversityDaniel E. Vanden Berk - FermilabTimothy A Reichard - Pennsylvania State UniversityPatrick B Hall - Pontificia Universidad Católica de ChileDonald P Schneider - Pennsylvania State UniversityMark SubbaRao - Department of Astronomy and Astrophysics, 5640 South Ellis Avenue, Chicago, IL 60637Anirudda R Thakar - Johns Hopkins UniversityDonald G York - University of Chicago
- Publication Details
- The Astronomical journal, v 124(1), pp 1-17
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000176272900001
- Scopus ID
- 2-s2.0-0042524072
- Other Identifier
- 991019201429404721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics