The z=0.54 LoBAL Quasar SDSS J085053.12+445122.5: II. The Nature of Partial Covering in the Broad-Absorption-Line Outflow

Abstract

It has been known for 20 years that the absorbing gas in broad absorption line quasars does not completely cover the continuum emission region, and that partial covering must be accounted for to accurately measure the column density of the outflowing gas. However, the nature of partial covering itself is not understood. Extrapolation of the SimBAL spectral synthesis model of the HST COS UV spectrum from SDSS J0850+4451 reported by Leighly et al. 2018 to non-simultaneous rest-frame optical and near-infrared spectra reveals evidence that the covering fraction has wavelength dependence, and is a factor of 2.5 times higher in the UV than in the optical and near-infrared bands. The difference in covering fraction can be explained if the outflow consists of clumps that are small and either structured or clustered relative to the projected size of the UV continuum emission region, and have a more diffuse distribution on size scales comparable to the near-infrared continuum emission region size. The lower covering fraction over the larger physical area results in a reduction of the measured total column density by a factor of 1.6 compared with the UV-only solution. This experiment demonstrates that we can compare rest-frame UV and near-infrared absorption lines, specifically HeI*10830, to place constraints on the uniformity of absorption gas in broad absorbing line quasars.

arXiv commentRevised version after responding to referee report

References in corpus (65)

• emcee: The MCMC Hammer
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• Spectral Energy Distributions of Hard X-ray selected AGNs in the XMDS Survey
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
• Quasar Feedback: More Bang for Your Buck
• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• Sherpa: a Mission-Independent Data Analysis Application
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• Keplerian Motion of Broad-Line Region Gas as Evidence for Supermassive Black Holes in Active Galactic Nuclei
• The innermost region of AGN tori: implications from the HST/NICMOS Type 1 point sources and near-IR reverberation
• Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955
• An Atlas of Computed Equivalent Widths of Quasar Broad Emission Lines
• The Quasar Outflow Contribution to AGN Feedback: VLT Measurements of SDSS J0318-0600
• Metallicities and Abundance Ratios from Quasar Broad Emission Lines
• Broad Absorption Line Variability on Multi-Year Timescales in a Large Quasar Sample
• The Black Hole Mass-Bulge Luminosity Relationship for Active Galactic Nuclei from Reverberation Mapping and Hubble Space Telescope Imaging
• Polarization of Broad Absorption Line QSOs I. A Spectropolarimetric Atlas
• The Mass of the Central Black Hole in the Seyfert Galaxy NGC 3783
• High-Resolution Keck Spectra of the Associated Absorption Lines in 3C 191
• Major contributor to AGN feedback: VLT X-shooter observations of SIV BAL QSO outflows
• A High-Velocity Narrow Absorption Line Outflow in the Quasar J212329.46-005052.9
• Variability in Quasar Broad Absorption Line Outflows I. Trends in the Short-Term versus Long-Term Data
• Broad P V Absorption in the BALQSO, PG 1254+047: Column Densities, Ionizations and Metal Abundances in BAL Winds
• A Census of Intrinsic Narrow Absorption Lines in the Spectra of Quasars at z=2-4
• The Intrinsically X-ray Weak Quasar PHL 1811. II. Optical and UV Spectra and Analysis
• Reverberation Mapping of Luminous Quasars at High-z
• X-ray/UV Campaign on the Mrk 279 AGN Outflow: Constraining Inhomogeneous Absorber Models
• Variability in quasar broad absorption line outflows II. Multi-epoch monitoring of SiIV and CIV BAL variability
• The Ionized Gas and Nuclear Environment in NGC 3783 V. Variability and Modeling of the Intrinsic Ultraviolet Absorption
• Variability in Quasar Broad Absorption Line Outflows III. What Happens on the Shortest Time-scales?
• Emergence of a Broad-Absorption-Line Outflow in the Narrow-line Seyfert 1 Galaxy WPVS 007
• Measuring Column Densities in Quasar Outflows: VLT Observations of QSO 2359-1241
• The near-infrared broad emission line region of active galactic nuclei. II. The one-micron continuum
• Dust-Deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission
• Spectacular Shells in the Host Galaxy of the QSO MC2 1635+119
• Mining for Dust in Type 1 Quasars
• Weak Hard X-ray Emission from Two Broad Absorption Line Quasars Observed with NuSTAR: Compton-thick Absorption or Intrinsic X-ray Weakness?
• Hot-Dust-Poor Type 1 Active Galactic Nuclei in the COSMOS Survey
• The Extreme High-Velocity Outflow in Quasar PG0935+417
• BAL phosphorus abundance and evidence for immense ionic column densities in quasar outflows: VLT X-Shooter observations of quasar SDSS J1512+1119
• Tracing the Outflow of a z=0.334 FeLoBAL: New Constraints from Low-Ionization Absorbers in FBQS J1151+3822
• Improved Spectrophotometric Calibration of the SDSS-III BOSS Quasar Sample
• FUSE Observation of the Narrow-line Seyfert 1 Galaxy RE 1034+39
• The z=0.54 LoBAL Quasar SDSS J085053.12+445122.5: I. Spectral Synthesis Analysis Reveals a Massive Outflow
• Hot-Dust-Poor Quasars in Mid-Infrared and Optically Selected Samples
• Variability in Low Ionization Broad Absorption Line Outflows
• VLT+UVES Spectroscopy of the CaII LoBAL Quasar SDSS J030000.56+004828.0
• A compact, metal-rich, kpc-scale outflow in FBQS J0209-0438: Detailed diagnostics from HST/COS extreme UV observations
• Variable Reddening and Broad Absorption Lines in the Narrow-line Seyfert 1 Galaxy WPVS 007: an Origin in the Torus
• HST and Ground-Based Spectroscopy of Quasar Outflows: From Mini-BALs to BALs
• Constraining FeLoBAL outflows from absorption line variability
• A Census of Quasar-Intrinsic Absorption in the Hubble Space Telescope Archive: Systems from High Resolution Echelle Spectra
• Strong UV and X-ray variability of the Narrow Line Seyfert 1 Galaxy WPVS 007 -- on the nature of the X-ray low state
• KOSMOS and COSMOS: New facility instruments for the NOAO 4-meter telescopes
• Quasars with PV broad absorption in BOSS data release 9
• Quasar outflow energetics from broad absorption line variability
• The orientation and polarization of broad absorption line quasars
• Fe II and Mg II in Luminous, Intermediate-Redshift Narrow-line Seyfert 1 Galaxies from the Sloan Digital Sky Survey

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• The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$
• Multi-phase black-hole feedback and a bright [CII] halo in a Lo-BAL quasar at $z\sim 6.6$
• NuSTAR Observations of Intrinsically X-ray Weak Quasar Candidates: An Obscuration-Only Scenario
• The Physical Properties of Low-Redshift FeLoBAL Quasars: II. The Rest-Frame Optical Emission Line Properties
• The Properties of Low-Redshift FeLoBAL Quasars: III. The Location and Geometry of the Outflows
• Investigating the {Origin} of the Absorption-Line Variability in Narrow-Line Seyfert 1 Galaxy WPVS 007
• High Mass Flow Rate in a BAL Outflow of Quasar SDSS J1130+0411
• Dust Dynamics in AGN Winds: A New Mechanism For Multiwavelength AGN Variability
• Multi-epoch spectroscopy of Mg II broad absorption line transitions
• The X-Rays wind connection in PG 2112+059
• A Targeted Search for Variable Gravitationally Lensed Quasars