Magnetohydrodynamic Winds Driven by the Line Force from the Standard Thin Disk around Supermassive Black Holes. I. The Case of Weak Magnetic Field

Abstract

Absorption lines with high blue-shifted velocities are frequently found in the ultraviolet (UV) and X-ray spectra of luminous active galactic nuclei (AGNs). This implies that high-velocity winds/outflows are common in AGNs. In order to study the formation of high-velocity winds, especially ultrafast outflows (UFOs), we perform two-dimensional magnetohydrodynamic (MHD) simulations. Initially, a magnetic field is set to be weaker than the gas pressure at the disk surface. In our simulations, line force operates on the region like filaments because the X-ray radiation from corona is shielded by dense gas in the inner region at some angle. The location of filaments changes with time and then the line-driven winds are exposed to X-ray and become highly ionized. The line force at the UV bands does not directly drive the highly ionized winds. In the sense of time average, the properties of high-velocity winds meet the formation condition of UFOs. Compared with line force, the function of magnetic field is negligible in directly driving winds. In the MHD model, the region around the rotational axis becomes magnetic-pressure dominated, which prevents gases from spreading to higher latitudes and then enhances the gas column density at middle and low latitudes (20${}^{\mathrm{o}}$--70${}^{\mathrm{o}}$). Higher column density is helpful to shield X-ray photons, which causes the line force to be more effective in the MHD model than in the hydrodynamic model. Higher-velocity winds with a broader opening angle are produced in the MHD model.

arXiv comment15 pages, 7 figures, Accepted for publication in ApJ

References in corpus (67)

• PLUTO: a Numerical Code for Computational Astrophysics
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• Evidence for ultra-fast outflows in radio-quiet AGNs: I - detection and statistical incidence of Fe K-shell absorption lines
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• The PLUTO Code for Adaptive Mesh Computations in Astrophysical Fluid Dynamics
• X-ray reverberation around accreting black holes
• A high velocity ionised outflow and XUV photosphere in the narrow emission line quasar PG1211+143
• Black Hole Winds
• Wind from the black-hole accretion disk driving a molecular outflow in an active galaxy
• Global Structure of Three Distinct Accretion Flows and Outflows around Black Holes through Two-Dimensional Radiation-Magnetohydrodynamic Simulations
• Black hole feedback in the luminous quasar PDS 456
• The Suzaku view of highly-ionised outflows in AGN: I - Statistical detection and global absorber properties
• Evidence for ultra-fast outflows in radio-quiet AGNs: II - detailed photo-ionization modeling of Fe K-shell absorption lines
• The tight relation between X-ray and ultraviolet luminosity of quasars
• Radiation driven winds from luminous accretion disks
• Evidence for ultra-fast outflows in radio-quiet AGNs: III - location and energetics
• A soft X-ray study of Type I AGN observed with Chandra HETGS
• Radiative Transfer and Acceleration in Magnetocentrifugal Winds
• Parabolic Jets from the Spinning Black Hole in M87
• Numerical simulations of mass outflows driven from accretion disks by radiation and magnetic forces
• Ultra-fast outflows in radio-loud active galactic nuclei
• On the size and location of the X-ray emitting coronae around black holes
• Quasars as standard candles I: The physical relation between disc and coronal emission
• Dynamics of Accretion Flows Irradiated by a Quasar
• A Census of Intrinsic Narrow Absorption Lines in the Spectra of Quasars at z=2-4
• Line-driven Disk Winds in Active Galactic Nuclei: The Critical Importance of Ionization and Radiative Transfer
• The Turbulent Magnetic Prandtl Number of MHD Turbulence in Disks
• Two-temperature coronal flow above a thin disk
• Thin accretion disks are stabilized by a strong magnetic field
• Confirmation of and Variable Energy Injection by a Near-Relativistic Outflow in APM 08279+5255
• The X-ray Energy Dependence of the Relation between Optical and X-ray Emission in Quasars
• Evidence for a radiatively driven disc-wind in PDS 456?
• On the Origin of Intrinsic Narrow Absorption Lines in z<1 QSOs
• The large scale magnetic fields of thin accretion disks
• Variability Tests for Intrinsic Absorption Lines in Quasar Spectra
• Radiation Hydrodynamic Simulations of Line-Driven Disk Winds for Ultra Fast Outflows
• Line-driven disk wind model for ultra-fast outflows in active galactic nuclei -- Scaling with luminosity
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
• Short term X-ray spectral variability of the quasar PDS 456 observed in a low flux state
• The Extreme High-Velocity Outflow in Quasar PG0935+417
• A new relativistic component of the accretion disk wind in PDS 456
• Modeling High-Velocity QSO Absorbers with Photoionized MHD Disk-Winds
• Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow
• Resolving the soft X-ray ultra fast outflow in PDS 456
• Multiphase quasar-driven outflows in PG 1114+445. I. Entrained ultra-fast outflows
• Magnetically-driven jets and winds from weakly magnetized accretion disks
• Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation
• Thermal Disk Winds in X-ray Binaries: Realistic Heating and Cooling Rates Give Rise to Slow, but Massive Outflows
• The outflows accelerated by the magnetic fields and radiation force of accretion disks
• A Mini-BAL Outflow at 900 pc from the Central Source: VLT/X-shooter Observations
• Variable Nature of Magnetically-Driven Ultra-Fast Outflows
• Tracking the Iron K$\alpha$ line and the Ultra Fast Outflow in NGC 2992 at different accretion states
• Imprints of a high velocity wind on the soft x-ray spectrum of PG 1211+143
• The Ultra-Fast Outflow of the Quasar PG 1211+143 as Viewed by Time-Averaged Chandra Grating Spectroscopy
• Radiation-hydrodynamic simulations of thermally-driven disc winds in X-ray binaries: A direct comparison to GRO J1655-40
• High Velocity Outflows in Narrow Absorption Line Quasars
• An Unusual Mini-BAL Quasar at z=4.59
• Magnetothermal disk winds in X-ray binaries: poloidal magnetic fields suppress thermal winds
• X-ray Emissions from Three-dimensional Magnetohydrodynamic Coronal Accretion Flows
• X-ray flaring in PDS 456 observed in a high-flux state
• Observational evidence for AGNs feedback at parsec scale
• Numerical simulations of winds driven by radiation force from the corona above a thin disk
• Magnetically Advected Winds
• Thermal wind from hot accretion flows at large radii
• Magnetohydrodynamic numerical simulation of the outflows driven by magnetic field and radiation force from the corona above a thin disk
• Modelling X-ray RMS spectra II: the ultra-fast outflow of PDS 456
• Numerical Examination of the Stability of an Exact Two-dimensional Solution for Flux Pile-up Magnetic Reconnection

Cited by in corpus (6)

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• The dynamical structure of the outflows driven by a large-scale magnetic field
• Can warm absorbers be driven by ultra-fast outflows?
• Effect of radiation drag on the line-force-driven winds
• Numerical simulations of the line-force-driven winds from active galactic nuclei: The special relativistic effects