Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-07-23
Astronomy and Astrophysics
Astrophysics
9 pages, 1 figure, accepted by ApJ Letters. Table 1 has been revised with a 0.24 mag zero point correction to the BAL QSO U-Bj
Scientific paper
10.1086/311599
We report the discovery of five broad-absorption-line (BAL) QSOs in a complete sample of 111 ultraviolet excess (UVX) QSO candidates also detected in the NRAO VLA Sky Survey. All five BAL QSOs, which include two high-ionization BAL QSOs and three low-ionization BAL QSOs, are formally radio-loud. Of QSOs with z > 0.4, 3+/-2% show low-ionization BALs, and of QSOs with z > 1.5, all radio-loud, 9+/-5% show BALs; these frequencies are consistent with those of optical surveys. While the first 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 observed radio-to-optical luminosity, these QSOs are UVX selected and probably free of significant dust along the line of sight. We point out unusual features in two of the BAL QSOs and discuss the significance finding these heretofore rare objects.
Becker Robert H.
Boyle Brian J.
Breugel Wil van
Brotherton Michael S.
Croom Scott M.
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