X-ray selected broad absorption line quasars in SDSS-V: BALs and non-BALs span the same range of X-ray properties

Abstract

Broad absorption line (BAL) quasars are often considered X-ray weak relative to their optical/UV luminosity, whether intrinsically (i.e., the coronal emission is fainter) or due to large column densities of absorbing material. The SDSS-V is providing optical spectroscopy for samples of quasar candidates identified by eROSITA as well as Chandra, XMM or Swift, making the resulting datasets ideal for characterising the BAL quasar population within an X-ray selected sample. We use the Balnicity Index (BI) to identify the BAL quasars based on absorption of the CIV $\lambda 1549$ emission line in the optical spectra, finding 143 BAL quasars in our sample of 2317 X-ray selected quasars within $1.5\le z\le 3.5$. This observed BAL fraction of $\approx$ 6 per cent is comparable to that found in optically selected samples. We also identify absorption systems via the Absorption Index (AI) which includes mini-BALs and NALs, finding 954 quasars with AI $>0$. We consider the CIV emission space (equivalent width vs. blueshift) to study the BAL outflows within the context of the radiatively driven accretion disc-wind model. X-ray selection excludes the highest outflow velocities in emission but includes the full range of absorption velocities which we suggest is consistent with the BAL gas being located further from the X-ray corona than the emitting gas. We observe both X-ray weak and X-ray strong BALs (via the optical-to-X-ray spectral slope, ${\alpha }_{\text{ox}}$) and detect little evidence for differing column densities between the BAL and non-BAL quasars, suggesting the BALs and non-BALs have the same shielding gas and intrinsic X-ray emission.

arXiv comment19 pages, 16 figures, 3 appendices, accepted for publication in MNRAS

References in corpus (95)

• The Sloan Digital Sky Survey: Technical Summary
• The Demography of Massive Dark Objects in Galaxy Centres
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• The Multi-Object, Fiber-Fed Spectrographs for SDSS and the Baryon Oscillation Spectroscopic Survey
• The eROSITA X-ray telescope on SRG
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• The Soft X-Ray Properties of a Complete Sample of Optically Selected Quasars II. Final Results
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• The LOFAR Two-metre Sky Survey -- V. Second data release
• The Sloan Digital Sky Survey Quasar Catalog: Fourteenth Data Release
• Unification of Luminous Type 1 Quasars through CIV Emission
• The X-ray Properties of the Most-Luminous Quasars from the Sloan Digital Sky Survey
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• Mass Functions of the Active Black Holes in Distant Quasars from the Large Bright Quasar Survey, the Bright Quasar Survey, and the Color-Selected Sample of the SDSS Fall Equatorial Stripe
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• The XMM-Newton serendipitous survey IX. The fourth XMM-Newton serendipitous source catalogue
• Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• The eROSITA Final Equatorial Depth Survey (eFEDS): The X-ray catalog
• Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
• The evolution of the hard X-ray luminosity function of AGN
• The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
• Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• The Rapid ASKAP Continuum Survey I: Design and First Results
• Radio galaxies and feedback from AGN jets
• The Frequency and Radio Properties of Broad Absorption Line Quasars
• Improved redshifts for SDSS quasar spectra
• The tight relation between X-ray and ultraviolet luminosity of quasars
• A strong redshift dependence of the broad absorption line quasar fraction
• The Intrinsic Fraction of Broad Absorption Line Quasars
• The Rapid ASKAP Continuum Survey Paper II: First Stokes I Source Catalogue Data Release
• An Exploratory Chandra Survey of a Well-Defined Sample of 35 Large Bright Quasar Survey Broad Absorption Line Quasars
• Aborted jets and the X-ray emission of radio-quiet AGNs
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• A global view of the inner accretion and ejection flow around super massive black holes: radiation driven accretion disk winds in a physical context
• HST STIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow-line Seyfert 1 Galaxies: II. Modeling and Interpretation
• Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey Quasars
• The eROSITA Final Equatorial-Depth Survey (eFEDS): Identification and characterization of the counterparts to the point-like sources
• The X-ray Jets of Active Galaxies
• BAL and non-BAL quasars: continuum, emission and absorption properties establish a common parent sample
• The eROSITA Final Equatorial-Depth Survey (eFEDS): The AGN Catalogue and its X-ray Spectral Properties
• Extreme-Velocity Quasar Outflows and the Role of X-ray Shielding
• Evidence that 50% of BALQSO Outflows Are Situated at Least 100 pc from the Central Source
• Weak Hard X-ray Emission from Broad Absorption Line Quasars: Evidence for Intrinsic X-ray Weakness
• Line Shifts, Broad-Line Region Inflow, and the Feeding of AGNs
• The Physical Nature of Polar Broad Absorption Line Quasars
• Weak Hard X-ray Emission from Two Broad Absorption Line Quasars Observed with NuSTAR: Compton-thick Absorption or Intrinsic X-ray Weakness?
• Testing Quasar Unification: Radiative Transfer in Clumpy Winds
• The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
• Broad Absorption Line Quasars in the Early Data Release from the Sloan Digital Sky Survey
• The Extreme High-Velocity Outflow in Quasar PG0935+417
• SPIDERS: Selection of spectroscopic targets using AGN candidates detected in all-sky X-ray surveys
• The average absorption properties of broad absorption line quasars at 800 < lambda_rest < 3000 Å, and the underlying physical parameters
• The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars
• X-Ray Insights Into the Physics of Mini-BAL Quasar Outflows
• Radiation pressure confinement - IV. Application to broad absorption line outflows
• Testing AGN outflow and accretion models with CIV and HeII emission line demographics in z=2 quasars
• Line-driven radiative outflows in luminous quasars
• The Intrinsic Fractions and Radio Properties of Low Ionization Broad Absorption Line Quasars
• VLT/X-Shooter Survey of BAL Quasars: Large Distance Scale and AGN Feedback
• The final SDSS-IV/SPIDERS X-ray point source spectroscopic catalogue
• HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame: I. The Most Energetic Outflows in the Universe and Other Discoveries
• The Long-Term X-Ray Variability of Broad Absorption Line Quasars
• On the absorption of X-ray bright broad absorption line quasars
• Variable Reddening and Broad Absorption Lines in the Narrow-line Seyfert 1 Galaxy WPVS 007: an Origin in the Torus
• What controls the UV-to-X-ray continuum shape in quasars?
• Emergence and Variability of Broad Absorption Line Quasar Outflows
• Characterizing Quasar CIV Emission-line Measurements from Time-resolved Spectroscopy
• A revision of the X-ray absorption nature of the BALQSOs
• On the origins of C IV absorption profile diversity in broad absorption line quasars
• The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars
• The X-Ray Properties of the Optically Brightest Mini-BAL Quasars from the Sloan Digital Sky Survey
• A disc wind model for blueshifts in quasar broad emission lines
• The Contribution of Quasar Absorption Outflows to AGN Feedback
• The Frequency of Intrinsic X-ray Weakness Among Broad Absorption Line Quasars
• The case for inflow of the broad-line region of active galactic nuclei
• Appearance vs Disappearance of broad absorption line troughs in quasars
• Hunting for Metals Using XQ-100 Legacy Survey Composite Spectra
• No redshift evolution in the rest-frame UV emission line properties of quasars from z=1.5 to z=4.0
• Surveys of the Cosmic X-ray Background
• Wavelength Dependences of the Optical/UV and X-ray Luminosity Correlations of Quasars
• Connection between Emission and Absorption Outflows through the Study of Quasars with Extremely-High Velocity Outflows
• The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources
• The intrinsic X-ray luminosity distribution of an optically-selected SDSS quasar population
• A novel Bayesian approach for decomposing the radio emission of quasars: II. Link between quasar radio emission and black hole mass
• The Extragalactic Serendipitous Swift Survey (ExSeSS) -- I. Survey definition and measurements of the X-ray number counts
• X-ray selected BALQSOs
• BAL Outflows are common in Low Eddington Ratio AGN

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