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9 papers · 2 filters
X-ray and Multiwavelength Insights into the Inner Structure of High-Luminosity Disc-Like Emitters
B. Luo, W. N. Brandt, M. Eracleous +5
We present X-ray and multiwavelength studies of a sample of eight high-luminosity active galactic nuclei (AGNs) with disc-like Hβemission-line profiles selected from the Sloan Digi…
The Sloan Digital Sky Survey quasar catalog: ninth data release
Isabelle Pâris, Patrick Petitjean, Eric Aubourg +73
We present the Data Release 9 Quasar (DR9Q) catalog from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III. The catalog includes all BOSS objec…
Hierarchical Bayesian Detection Algorithm for Early-Universe Relics in the Cosmic Microwave Background
Stephen M. Feeney, Matthew C. Johnson, Jason D. McEwen +2
A number of theoretically well-motivated additions to the standard cosmological model predict weak signatures in the form of spatially localized sources embedded in the cosmic micr…
Evolution of the Population of Very Strong MgII Absorbers
Paola Rodríguez Hidalgo, Kaylan Wessels, Jane Charlton +4
We present a study of the evolution of several classes of MgII absorbers, and their corresponding FeII absorption, over a large fraction of cosmic history: 2.3 to 8.7 Gyrs from the…
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 <…
The Baryon Oscillation Spectroscopic Survey of SDSS-III
Kyle S. Dawson, David J. Schlegel, Christopher P. Ahn +162
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the…