Systematic asymmetries in H lines of radio-loud quasars

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Abstract
We report spectroscopic observations of the [O III] λλ4959,5007 and Hβ region in a sample of 47 radio-loud quasars, and find that the profile of this line is consistently asymmetrical towards the red. Some of these asymmetries can be produced by contaminating lines of Fe II of strengths similar to those proposed by earlier workers. In other cases, however, two further processes may be necessary: there may be contaminating lines such as He Iλλ4922,5016 and broad [O III] λλ4959,5007, or intrinsic asymmetries caused by large-scale motions of high-velocity gas. We attempt to investigate whether genuine Hβ asymmetry is plausible by inspecting the Hα profiles of our lower-redshift objects, with inconclusive results.

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