Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey

  title={Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey},
  author={Patrick B. Hall and Scott F. Anderson and Michael A. Strauss and Donald G. York and Gordon T. Richards and Xiaohui Fan and Gillian R. Knapp and Donald P. Schneider and Daniel E. vanden Berk and Thomas R. Geballe and Amanda. E. Bauer and Robert H. Becker and Marc Davis and Hans–Walter Rix and Robert C. Nichol and Neta A. Bahcall and Jonathan Brinkmann and Robert J. Brunner and Andrew J. Connolly and Istv{\'a}n Csabai and Mamoru Doi and Masataka Fukugita and James E. Gunn and Zolt{\'a}n Haiman and Michael Harvanek and Timothy M. Heckman and Gregory S. Hennessy and Naohisa Inada and Željko Ivezi{\'c} and David E. Johnston and Scott J. Kleinman and Julian H. Krolik and Jurek Krzesinski and Peter Z. Kunszt and Donald Q. Lamb and Daniel C. Long and Robert H. Lupton and Gajus A. Miknaitis and Jeffrey A. Munn and Vijay K. Narayanan and Eric H. Neilsen and P. R. Newman and Atsuko Nitta and Sadanori Okamura and Laura Pentericci and Jeffrey R. Pier and David J. Schlegel and Stephanie A. Snedden and Alexander S. Szalay and Anirudda R. Thakar and Zlatan I. Tsvetanov and Richard L. White and Wei Zheng},
  journal={The Astrophysical Journal Supplement Series},
  pages={267 - 309}
The Sloan Digital Sky Survey has confirmed the existence of populations of broad absorption line (BAL) quasars with various unusual properties. We present and discuss 23 such objects and consider the implications of their wide range of properties for models of BAL outflows and quasars in general. We have discovered one BAL quasar with a record number of absorption lines. Two other similarly complex objects with many narrow troughs show broad Mg II absorption extending longward of their systemic… 

Broad Absorption Line Quasars in the Early Data Release from the Sloan Digital Sky Survey

A new broad absorption line (BAL) quasar sample is derived from the first data released by the Sloan Digital Sky Survey. With 116 objects, it is the largest BAL quasar sample yet assembled. Over the

FR II Broad Absorption Line Quasars and the Life Cycle of Quasars

By combining the Sloan Digitized Sky Survey Third Data Release quasar list with the VLA FIRST survey, we have found five new objects having both broad absorption lines (BALs) in their optical spectra


We present a study of the variability of broad absorption lines (BALs) in a uniformly radio-selected sample of 28 BAL quasars using the archival data from the FIRST Bright Quasar Survey and the Sloan


We have investigated a sample of 2099 broad absorption line (BAL) quasars with z = 1.7–2.2 built from the Sloan Digital Sky Survey Data Release Seven and the Wide-field Infrared Survey. This sample

Polar Outflows in Six Broad Absorption Line Quasars

Using radio observations by FIRST and NVSS, we build a sample of 151 radio-variable quasars selected from the Sloan Digital Sky Survey Data Release 3 (SDSS DR3). Six (and probably another two) of

Broad Absorption Line Variability in Repeat Quasar Observations from the Sloan Digital Sky Survey

We present a time-variability analysis of 29 broad absorption line quasars (BALQSOs) observed in two epochs by the Sloan Digital Sky Survey. These spectra are selected from a larger sample of BALQSOs

A Quasar with Broad Absorption in the Balmer Lines

I report the discovery of blueshifted broad absorption line (BAL) troughs in at least six transitions of the Balmer series of hydrogen (Hβ to H9), and in Ca II, Mg II, and excited Fe II in the quasar


We present 21 examples of C iv broad absorption line (BAL) trough disappearance in 19 quasars selected from systematic multi-epoch observations of 582 bright BAL quasars (1.9 < z < 4.5) by the Sloan

Properties of radio-detected broad absorption line quasars from the Sloan Digital Sky Survey

We investigate the optical colors and radio morphologies of 214 broad absorption line (BAL) quasars with FIRST detections in the redshift range 1.68≤z≤4.93 drawn from the Sloan Digital Sky Survey

Broad-band spectral energy distribution of 3000 Å break quasars from the Sloan Digital Sky Survey

The Sloan Digital Sky Survey (SDSS) discovered a few unusual quasars with a characteristic break in the continuum around 3000 A that neither shows the typical structure of broad absorption line (BAL)



Optical Polarization and Line Variability in Quasars with Associated Absorption

The physical origin of associated absorption lines (zabs « qso) which are observed in radio-loud quasar is generally not well understood. Two observable properties, line variability and quasar

Broad Absorption Line Quasars in the Sloan Digital Sky Survey with VLA FIRST Radio Detections

We present 13 broad absorption line (BAL) quasars, including 12 new objects, identified in the Sloan Digital Sky Survey (SDSS) and matched within 2'' to sources in the FIRST radio survey catalog. The

The FIRST Radio-loud Broad Absorption Line QSO and Evidence for a Hidden Population of Quasars

We have discovered two low-ionization broad absorption line (BAL) quasars in programs to obtain optical spectra for radio-selected quasar candidates from the VLA Faint Images of the Radio Sky at

Composite Quasar Spectra from the Sloan Digital Sky Survey

We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 ≤ z

A Chandra Survey of Broad Absorption Line Quasars

We have carried out a survey with the Chandra X-Ray Observatory of a sample of 10 bright broad absorption line (BAL) quasars (QSOs). Eight of 10 sources are detected. The six brightest sources have

Low-ionization broad absorption lines in quasars

About 10% of optically selected radio-quiet quasars have broad high-ionization absorption lines and are known as broad absorption line quasars, or BALQSOs. About 15% of these optically selected

Hubble Space Telescope Observations of the Broad Absorption Line QuasarPG 0946+301

We analyze Hubble Space Telescope (HST) and ground-based spectra of the brightest broad absorption line (BAL) quasar in the UV: PG 0946+301. A detailed study of the absorption troughs as a function

Redshifted and Blueshifted Broad Lines in Luminous Quasars

We have observed a sample of 22 luminous quasars, in the range 2.0≲z≲2.5, at 1.6 μm with the near-infrared (NIR) spectrograph FSPEC on the Multiple Mirror Telescope. Our sample contains 13 radio-loud

The covering factor of quasar broad absorption line clouds

Two different interpretations of the phenomenon of broad absorption line (BAL) QSOs are presented and a resolution is suggested. One interpretation is that the BAL clouds cover most of the sky as

A quasar with ultrastrong, ultraviolet Fe ii emission

We report the discovery of an unusual quasar, 2226-3905, found during a survey of quasar candidates. The ultraviolet spectrum (intrinsic frame) of the object is dominated by extremely strong Fe II