3 papers
astro-ph.CO2013
Broad Absorption Line Quasars with Redshifted Troughs: High-Velocity Infall or Rotationally Dominated Outflows?
Patrick B. Hall, W. N. Brandt, P. Petitjean +19
We report the discovery in the Sloan Digital Sky Survey and the SDSS-III Baryon Oscillation Spectroscopic Survey of seventeen broad absorption line (BAL) quasars with high-ionizati…
astro-ph.CO2012
Broad Absorption Line Disappearance on Multi-Year Timescales in a Large Quasar Sample
N. Filiz Ak, W. N. Brandt, P. B. Hall +16
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 <…
astro-ph.CO2010
The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
Donald P. Schneider, Gordon T. Richards, Patrick B. Hall +45
We present the fifth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog, which is based upon the SDSS Seventh Data Release. The catalog, which contains 105,783 spectrosc…