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9 papers · 2 filters
Biases in the Quasar Mass-Luminosity Plane
Alireza Rafiee, Patrick B. Hall
We find that the recently reported departure from the Eddington luminosity limit for the highest quasar black hole masses at a given redshift is an artifact due to biases in black…
Implications of Dramatic Broad Absorption Line Variability in the Quasar FBQS J1408+3054
Patrick B. Hall, Konstantin Anosov, R. L. White +5
We have observed a dramatic change in the spectrum of the formerly heavily absorbed `overlapping-trough' iron low-ionization broad absorption line (FeLoBAL) quasar FBQS J1408+3054.…
The Extreme High-Velocity Outflow in Quasar PG0935+417
Paola Rodríguez Hidalgo, Fred Hamann, Patrick Hall
We report the detection of OVI 1031,1037 and NV 1238,1242 absorption in a system of "mini-broad" absorption lines (mini-BALs) previously reported to have variable CIV 1548,1550 in…
Chandra X-Ray Observations of Two Unusual BAL Quasars
Jesse A. Rogerson, Patrick B. Hall, Stephanie A. Snedden +2
We report sensitive Chandra X-ray non-detections of two unusual, luminous Iron Low-Ionization Broad Absorption Line Quasars (FeLoBALs). The observations do detect a non-BAL, wide-b…
A Catalog of Quasar Properties from SDSS DR7
Yue Shen, Gordon T. Richards, Michael A. Strauss +10
We present a compilation of properties of the 105,783 quasars in the SDSS Data Release 7 (DR7) quasar catalog. In this value-added product, we compile continuum and emission line m…
The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release
Naohisa Inada, Masamune Oguri, Min-Su Shin +20
We present the second report of our systematic search for strongly lensed quasars from the data of the Sloan Digital Sky Survey (SDSS). From extensive follow-up observations of 136…
Radio and X-ray Observations of the Type Ic SN 2007gr Reveal an Ordinary, Non-relativistic Explosion
Alicia M. Soderberg, Andreas Brunthaler, Ehud Nakar +2
We present extensive radio and X-ray observations of the nearby Type Ic SN 2007gr in NGC 1058 obtained with the Very Large Array and the Chandra X-ray Observatory and spanning 5 to…
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…
SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8
Ian D. McGreer, Patrick B. Hall, Xiaohui Fan +6
We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially ta…