Discovery of Radio-loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Rad.pdfVIP

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Discovery of Radio-loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Rad.pdf

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Discovery of Radio-loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Rad

Discovery of Radio-loud Broad Absorption Line QuasarsUsing Ultraviolet Excess and Deep Radio Selection1M. S. Brotherton, Wil van BreugelInstitute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, 7000 EastAvenue, P.O. Box 808, L413, Livermore, CA 94550; mbrother@igpp.llnl.gov, wil@igpp.llnl.govR. J. SmithMt. Stromlo Siding Spring Observatories, Australian National University, Private Bag, Weston Creek,ACT 2611, Australia; rsmith@mso.anu.edu.auB. J. BoyleAnglo-Australian Telescope, PO Box 296, Epping, NSW 2121, Australia; director@aaoepp.aao.gov.auT. Shanks, S. M. CroomDepartment of Physics, University of Durham, South Road, Durham, DH1 3LE, UKLance MillerDepartment of Physics, Oxford University, Keble Road, Oxford, OX1 3RH, UK; l.miller1@physics.ox.ac.ukRobert H. BeckerUniversity of California at Davis, Davis, CA 95616; and Institute of Geophysics and Planetary Physics,Lawrence Livermore National Laboratory, 7000 East Avenue, P.O. Box 808, L413, Livermore, CA 94550;bob@igpp.llnl.govABSTRACTWe report the discovery of ve broad-absorption-line (BAL) QSOs in a complete sample of111 ultraviolet excess (UVX) QSO candidates also detected in the NRAO VLA Sky Survey. Allve BAL QSOs, which include two high-ionization BAL QSOs and three low-ionization BALQSOs, are formally radio-loud. Of QSOs with z 0:4, 32% show low-ionization BALs, and ofQSOs with z 1:5, all radio-loud, 95% show BALs; these frequencies are consistent with thoseof optical surveys. While the rst reported radio-loud BAL QSO, FIRST J155633.8+351758,is likely to be heavily dust reddened and thus less radio-loud than indicated by its observedradio-to-optical luminosity, these QSOs are UVX selected and probably free of signicant dustalong the line of sight. We point out unusual features in two of the BAL QSOs and discuss thesignicance nding these heretofore rare objects.Subject headings: quasars: absorption lines, quasars: emission lines, quasars: general 1Based on observations