Results 1 to 10 of about 16,058 (175)
A Balmer-line Broad Absorption Line Quasar [PDF]
, 2006 I report the discovery of blueshifted broad absorption line (BAL) troughs in at least six transitions of the Balmer series of hydrogen (Hbeta to H9) and in CaII, MgII and excited FeII in the quasar SDSS J125942.80+121312.6. This is only the fourth active
Hall, Patrick B.
core +3 more sources
Probing Broad Absorption Line Quasar Outflows: X-ray Insights [PDF]
Advances in Space Research, 2002 Energetic outflows appear to occur in conjunction with active mass accretion onto supermassive black holes. These outflows are most readily observed in the approximately 10% of quasars with broad absorption lines, where the observer's line of sight ...
Brandt +29 more
core +3 more sources
Continuum and Emission-Line Properties of Broad Absorption Line Quasars [PDF]
The Astronomical Journal, 2003 We investigate the continuum and emission-line properties of 224 broad absorption line quasars (BALQSOs) with 0 ...
Daniel E. Vanden Berk +11 more
core +4 more sources
Microlensing of Broad Absorption Line Quasars
Monthly Notices of the Royal Astronomical Society, 1997 The physical nature of the material responsible for the high--velocity, broad-absorption line features seen in a small fraction of quasar spectra has been the subject of debate since their discovery.
Belle, Kunegunda E., Lewis, Geraint F.
core +2 more sources
Quasar outflow energetics from broad absorption line variability [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 Quasar outflows have long been recognized as potential contributors to the co-evolution between supermassive black holes (SMBHs) and their host galaxies.
Capellupo, D. M. +4 more
core +2 more sources
Extreme Variability in a Broad Absorption Line Quasar [PDF]
The Astrophysical Journal, 2017 CRTS J084133.15+200525.8 is an optically bright quasar at z=2.345 that has shown extreme spectral variability over the past decade. Photometrically, the source had a visual magnitude of V~17.3 between 2002 and 2008.
Arav, Nahum +11 more
core +5 more sources
Balmer Absorption in Iron Low-ionization Broad Absorption Line Quasars
The Astrophysical JournalWhile C iv is the most common absorption line in broad absorption line quasar spectra, Balmer absorption lines (BALs) are among the rarest. We present analysis of Balmer absorption in a sample of 14 iron low-ionization BAL quasars (FeLoBALQs); eight are ...
Karen M. Leighly +6 more
doaj +3 more sources
The intrinsic fraction of broad-absorption line quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We carefully reconsider the problem of classifying broad absorption line quasars (BALQSOs) and derive a new, unbiased estimate of the intrinsic BALQSO fraction from the SDSS DR3 QSO catalogue. We first show that the distribution of objects selected by the so-called ``absorption index'' (AI) is clearly bimodal in log(AI), with only one mode ...
Knigge, Christian +3 more
openaire +3 more sources
Broad absorption line variability in radio-loud quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We investigate C IV broad absorption line (BAL) variability within a sample of 46 radio-loud quasars (RLQs), selected from SDSS/FIRST data to include both core-dominated (39) and lobe-dominated (7) objects. The sample consists primarily of high-ionization BAL quasars, and a substantial fraction have large BAL velocities or equivalent widths; their ...
Welling, C. A. +4 more
openaire +2 more sources
SPECTROPOLARIMETRY OF RADIO-SELECTED BROAD ABSORPTION LINE QUASARS [PDF]
The Astrophysical Journal Supplement Series, 2010 We report spectropolarimetry of 30 radio-selected broad absorption line (BAL) quasars with the Keck Observatory, 25 from the sample of Becker et al. (2000). Both high and low-ionization BAL quasars are represented, with redshifts ranging from 0.5 to 2.5. The spectropolarimetric properties of radio-selected BAL quasars are very similar to those of radio-
DiPompeo, M. A. +6 more
openaire +2 more sources