A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5

Abstract

We present a catalog of 5039 broad absorption line (BAL) quasars (QSOs) in the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) QSO catalog that have absorption troughs covering a continuous velocity range >= 2000 km/s. We have fit ultraviolet (UV) continua and line emission in each case, enabling us to report common diagnostics of BAL strengths and velocities in the range -25,000 to 0 km/s for SiIV $\lambda$1400, CIV $\lambda$1549, AlIII $\lambda$1857, and MgII $\lambda$2799. We calculate these diagnostics using the spectrum listed in the DR5 QSO catalog, and also for spectra from additional SDSS observing epochs when available. In cases where BAL QSOs have been observed with Chandra or XMM-Newton, we report the X-ray monochromatic luminosities of these sources. We confirm and extend previous findings that BAL QSOs are more strongly reddened in the rest-frame UV than non-BAL QSOs and that BAL QSOs are relatively X-ray weak compared to non-BAL QSOs. The observed BAL fraction is dependent on the spectral signal-to-noise (S/N); for higher-S/N sources, we find an observed BAL fraction of approximately 15%. BAL QSOs show a similar Baldwin effect as for non-BAL QSOs, in that their CIV emission equivalent widths decrease with increasing continuum luminosity. However, BAL QSOs have weaker CIV emission in general than do non-BAL QSOs. Sources with higher UV luminosities are more likely to have higher-velocity outflows, and the BAL outflow velocity and UV absorption strength are correlated with relative X-ray weakness. These results are in qualitative agreement with models that depend on strong X-ray absorption to shield the outflow from over-ionization and enable radiative acceleration....

arXiv commentaccepted to ApJ; 65 pages, 18 figures; adjustments made to abstract formatting

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• The Nature of LoBAL QSOs: II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers
• Low-ionization iron-rich Broad Absorption-Line Quasar SDSS J1652+2650: Physical conditions in the ejected gas from excited FeII and metastable HeI
• Multi-phase investigation of outflows in the circumgalactic and interstellar media of luminous quasars at z~5
• Amoeba: An AGN Model of Optical Emissions Beyond steady-state Accretion discs
• A Giant Metrewave Radio Telescope Survey of Radio-loud Broad Absorption Line Quasars
• Deep absorption in SDSS J110511.15+530806.5
• Broadband nuclear emission in two radio-loud BAL quasars
• A New Member of the Fast and Furious Family: A Relativistic and Time-Variable UV Outflow in a Luminous Quasar
• A comparative study of ultraluminous infrared galaxies in the IRAS and SDSS Surveys
• The possible long-term periodic variability of the extremely luminous quasar WISE J090924.01+000211.1
• A quasar shedding its dust cocoon at redshift 2
• Near-infrared spectroscopy of extreme BAL QSOs from the QUBRICS bright quasar survey
• The imprint of AGN-driven outflows on the CGM: the case of Lyα nebulae around high-z quasars
• Evidence for the connection between star formation rate and evolutionary phases of quasars