The FIRST Radio-Loud Broad Absorption Line QSO and Evidence for a Hidden Population of Quasars
نویسندگان
چکیده
We have discovered two low-ionization broad absorption line quasars in programs to obtain optical spectra for radio-selected quasar candidates from the VLA FIRST Survey (Becker, White, & Helfand 1995). Both belong to the extremely rare class of BAL QSOs that exhibit narrow absorption lines from
منابع مشابه
Discovery of Radio-loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Radio Selection
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% ...
متن کاملPks 1004+13: a High Inclination, Highly Absorbed Radio-loud Qso – the First Radio-loud Bal Qso at Low Redshift? We Have Retrieved and Combined the Newsips- Calibrated Iue Data from the Short-wavelength Camera, In- Cluding Our Own Iue Observation (swp04942, Swp10850
The existence of BAL outflows in only radio-quiet QSOs was thought to be an important clue to mass ejection and the radio-loud – radio-quiet dichotomy. Recently a few radio-loud BAL QSOs have been discovered at high redshift. We present evidence that PKS1004+13 is a radio-loud BAL QSO. It would be the first known at low-redshift (zem = 0.24), and one of the most radio luminous. For PKS 1004+13,...
متن کاملIntrinsic Absorption in Radio-Selected QSOs
Moderate resolution spectra have been recorded for a sample of radio-selected QSOs (z ∼ 2.5) discovered in the “Faint Images of the Radio Sky at Twenty centimeters” (FIRST) VLA survey. This work is motivated by the study of a heterogeneous set of QSO absorption line spectra that showed that as many as 36% of the absorbers normally thought to be intergalactic are correlated with physical propert...
متن کاملExtended Lyman - α emission around bright quasars ⋆
Context. Quasars trace the most massive structures at high redshifts and their presence may influence the evolution of the massive host galaxies. Aims. We study the extended Lyα emission line regions (EELRs) around seven bright, mostly radio-quiet quasars (QSOs) at 2.7 < z < 4.5, and compare luminosities with EELRs around radio-loud QSOs reported in the literature. Methods. Using integral field...
متن کاملDiscovery of Newly Formed Broad Absorption Lines in a Radio-Loud Quasar
We report a serendipitous discovery of broad absorption lines that were newly formed in the spectrum of the high-redshift, luminous radio-loud quasar TEX 1726+344, in a time interval of only 12 years. This is the first quasar showing a transition from narrow absorption lines to broad absorption lines. It also becomes one of the few radio-loud broad absorption line quasars. The gas cloud respons...
متن کامل