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9 papers · 2 filters
Spectral Evolution in High Redshift Quasars from the Final BOSS Sample
Trey W. Jensen, M. Vivek, Kyle S. Dawson +17
We report on the diversity in quasar spectra from the Baryon Oscillation Spectroscopic Survey. After filtering the spectra to mitigate selection effects and Malmquist bias associat…
Extremely Red Quasars in BOSS
Fred Hamann, Nadia L. Zakamska, Nicholas Ross +11
Red quasars are candidate young objects in an early transition stage of massive galaxy evolution. Our team recently discovered a population of extremely red quasars (ERQs) in the B…
Discovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048
P. Noterdaeme, J. -K. Krogager, S. Balashev +10
We present the discovery of a molecular cloud at zabs=2.5255 along the line of sight to the quasar J0000+0048. We perform a detailed analysis of the absorption lines from ionic, ne…
The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
Isabelle Pâris, Patrick Petitjean, Nicholas P. Ross +43
We present the Data Release 12 Quasar catalog (DR12Q) from the Baryon Oscillation Spectroscopic Survey (BOSS) of the SDSS-III. This catalog includes all SDSS-III/BOSS objects that…
XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
S. Lopez, V. D'Odorico, S. L. Ellison +23
We describe the execution and data reduction of the European Southern Observatory Large Programme "Quasars and their absorption lines: a legacy survey of the high-redshift universe…
Extended Ly emission around quasars with eclipsing damped Ly systems
Hassan Fathivavsari, Patrick Petitjean, Pasquier Noterdaeme +4
We present spectroscopic observations of six high redshift ( 2) quasars, which have been selected for their Lyman (Ly) emission region being only partially c…
Nature and statistical properties of quasar associated absorption systems in the XQ-100 Legacy Survey
Serena Perrotta, Valentina D'Odorico, J. Xavier Prochaska +12
We statistically study the physical properties of a sample of narrow absorption line (NAL) systems looking for empirical evidences to distinguish between intrinsic and intervening…
Detection of emission lines from z ~ 3 DLAs towards the QSO J2358+0149
Raghunathan Srianand, Tanvir Hussain, Pasquier Noterdaeme +5
Using VLT/X-shooter we searched for emission line galaxies associated to four damped Lyman- systems (DLAs) and one sub-DLA at 2.73<=z<=3.25 towards QSO J2358+0149. We detect [O…
The Time-Domain Spectroscopic Survey: Understanding the Optically Variable Sky with SEQUELS in SDSS-III
John J. Ruan, Scott F. Anderson, Paul J. Green +27
The Time-Domain Spectroscopic Survey (TDSS) is an SDSS-IV eBOSS subproject primarily aimed at obtaining identification spectra of ~220,000 optically-variable objects systematically…