Radiation pressure confinement - IV. Application to broad absorption line outflows

Abstract

A fraction of quasars present broad absorption lines, produced by outflowing gas with typical velocities of 3000 - 10,000 km/s. If the outflowing gas fills a significant fraction of the volume where it resides, then it will be highly ionized by the quasar due to its low density, and will not produce the observed UV absorption. The suggestion that the outflow is shielded from the ionizing radiation was excluded by recent observations. The remaining solution is a dense outflow with a filling factor $f<10^{-3}$. What produces such a small $f$? Here we point out that radiation pressure confinement (RPC) inevitably leads to gas compression and the formation of dense thin gas sheets/filaments, with a large gradient in density and ionization along the line of sight. The total column of ionized dustless gas is a few times $10^{22}$ cm${}^{-2}$, consistent with the observed X-ray absorption and detectable P V absorption. The predicted maximal columns of various ions show a small dependence on the system parameters, and can be used to test the validity of RPC as a solution for the overionization problem. The ionization structure of the outflow implies that if the outflow is radiatively driven, then broad absorption line quasars should have $L/L_{\mathrm{Edd}}\gtrsim 0.1$.

arXiv commentAccepted for publication in MNRAS

References in corpus (54)

• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies
• A Reappraisal of the Solar Photospheric C/O Ratio
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• Dusty, Radiation Pressure Dominated Photoionization. I. Model Description, Structure And Grids
• The Dynamics of Radiation Pressure-Dominated HII Regions
• The origin of the Broad Line Region in Active Galactic Nuclei
• Continuum and Emission-Line Properties of Broad Absorption Line Quasars
• A strong redshift dependence of the broad absorption line quasar fraction
• Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955
• An Atlas of Computed Equivalent Widths of Quasar Broad Emission Lines
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• Are the Narrow Line Regions in Active Galaxies Dusty and Radiation Pressure Dominated?
• MHD Accretion-Disk Winds as X-ray Absorbers in AGNs
• An Exploratory Chandra Survey of a Well-Defined Sample of 35 Large Bright Quasar Survey Broad Absorption Line Quasars
• Radiative Transfer and Acceleration in Magnetocentrifugal Winds
• Broad Absorption Line Variability on Multi-Year Timescales in a Large Quasar Sample
• Major contributor to AGN feedback: VLT X-shooter observations of SIV BAL QSO outflows
• Variability in Quasar Broad Absorption Line Outflows I. Trends in the Short-Term versus Long-Term Data
• Numerical Simulations of Radiatively-Driven Dusty Winds
• HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO
• Broad P V Absorption in the BALQSO, PG 1254+047: Column Densities, Ionizations and Metal Abundances in BAL Winds
• Line-driven Disk Winds in Active Galactic Nuclei: The Critical Importance of Ionization and Radiative Transfer
• Metal Abundances and Ionization in QSO Intrinsic Absorbers
• What Determines the Depth of BALs? Keck HIRES Observations of BALQSO 1603+300
• {\it NuSTAR} Reveals an Intrinsically X-ray Weak Broad Absorption Line Quasar in the Ultraluminous Infrared Galaxy Markarian 231
• Variability in quasar broad absorption line outflows II. Multi-epoch monitoring of SiIV and CIV BAL variability
• Extreme-Velocity Quasar Outflows and the Role of X-ray Shielding
• Radiation pressure confinement - II. Application to the broad line region in active galactic nuclei
• Radiation Pressure Confinement - I. Ionized Gas in the ISM of AGN Hosts
• The Intrinsic Absorber in QSO 2359-1241: Keck and HST Observations
• The AGN Outflow in the HDFS Target QSO J2233-606 from a High-Resolution VLT/UVES Spectrum
• The Extreme High-Velocity Outflow in Quasar PG0935+417
• The average absorption properties of broad absorption line quasars at 800 < lambda_rest < 3000 Å, and the underlying physical parameters
• BAL phosphorus abundance and evidence for immense ionic column densities in quasar outflows: VLT X-Shooter observations of quasar SDSS J1512+1119
• Broad Absorption Line Quasars with Redshifted Troughs: High-Velocity Infall or Rotationally Dominated Outflows?
• Radiation Pressure Acceleration by X-rays in Active Galactic Nuclei
• The Ly-edge paradox and the need for obscured QSOs
• On the absorption of X-ray bright broad absorption line quasars
• Observational Evidence for a Multiphase Outflow in QSO FIRST J1044+3656
• On the evolution of gas clouds exposed to AGN radiation. I. Three-dimensional radiation hydrodynamic simulations
• On the diversity and complexity of absorption line profiles produced by outflows in Active Galactic Nuclei
• Non-linear Evolution of Rayleigh-Taylor Instability in a Radiation Supported Atmosphere
• Continuum Shielding and Flow Dynamics in Active Galactic Nuclei
• A revision of the X-ray absorption nature of the BALQSOs
• New Constraints on the Quasar Broad Emission Line Region
• Unveiling the Intrinsic X-ray Properties of Broad Absorption Line Quasars with a Relatively Unbiased Sample
• On the Unusual Depletions toward Sk 155, or What Are the Small Magellanic Cloud Dust Grains Made of?
• Response of the warm absorber cloud to a variable nuclear flux in active galactic nuclei
• Investigating the complex X-ray spectrum of a broad-line 2MASS red quasar: XMM-Newton observation of FTM 0830+3759

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