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Properties of Radio-Selected Broad Absorption-Line Quasars from the FIRST Survey

In a spectroscopic follow-up to the VLA FIRST survey, the FIRST Bright Quasar Survey (FBQS) has found 29 radio-selected broad absorption line (BAL) quasars. This sample provides the first opportunity to study the properties of radio-selected BAL quasars. Contrary to most previous studies, we establish that a significant population of radio-loud BAL quasars exists. Radio-selected BAL quasars display compact radio morphologies and possess both steep and flat radio spectra. Quasars with low-ionization BALs have a color distribution redder than that of the FBQS sample as a whole. The frequency of BAL quasars in the FBQS is significantly greater, perhaps by as much as a factor of two, than that inferred from optically selected samples. The frequency of BAL quasars appears to have a complex dependence on radio-loudness. The properties of this sample appear inconsistent with simple unified models in which BAL quasars constitute a subset of quasars seen edge-on.

preprint2000arXivOpen access
R. H. BeckerR. L. WhiteM. D. GreggM. S. BrothertonS. A. Laurent-MeuleisenN. Arav
astro-ph
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R. H. BeckerR. L. WhiteM. D. GreggM. S. BrothertonS. A. Laurent-MeuleisenN. Arav

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