Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?

Details Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars? Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?

2002-04-09

arxiv.org/abs/astro-ph/0204162v2

Astron.J. 124 (2002) 1

Astronomy and Astrophysics

Astrophysics

37 pages, 11 figures (2 color), 2 tables. AJ in press. v2: Added some references and some minor corrections from the proofs

Scientific paper

10.1086/341167

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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