Photoionization calculations of the radiation force due to spectral lines in AGNs

Abstract

One of the main mechanisms that could drive mass outflows in AGNs is radiation pressure due to spectral lines. Although straightforward to understand, the actual magnitude of the radiation force is challenging to compute because the force depends on the physical conditions in the gas, and the strength, spectral energy distribution (SED), and geometry of the radiation field. We present results from our photoionization and radiation transfer calculations of the force multiplier, $M(\xi ,t)$, using the same radiation field to compute the gas photoionization and thermal balance. We assume low gas density ($n=10^4\mathrm{c}{\mathrm{m}}^{-3}$) and column density ($N\le 10^{17}\mathrm{c}{\mathrm{m}}^{-2}$), a Boltzmann distribution for the level populations, and the Sobolev approximation. Here, we describe results for two SEDs corresponding to an unobscured and obscured AGN in NGC 5548. Our main results are the following: 1) although $M(\xi ,t)$ starts to decrease with $\xi$ for $\xi \gtrsim 1$ as shown by others, this decrease in our calculations is relatively gradual and could be non-monotonic as $M(\xi ,t)$ can increase by a factor of few for $\xi \approx 10-1000$; 2) at these same $\xi$ for which the multiplier is higher than in previous calculations, the gas is thermally unstable by the isobaric criterion; 3) non-LTE effects reduce $M(t,\xi )$ by over two orders of magnitude for $\xi \gtrsim 100$. The dynamical consequence of result (1) is that line driving can be important for $\xi$ as high as $1000$ when the LTE approximation holds, while result (2) provides a natural cloud formation mechanism that may account for the existence of narrow line regions. Result (3) suggests that line driving may not be important for $\xi \gtrsim 100$ in tenuous plasma.

arXiv comment13 pages, 6 figures, 1 table, project website: http://www.physics.unlv.edu/astro/xstartables.html

References in corpus (53)

• Observational Evidence of AGN Feedback
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• Athena: A New Code for Astrophysical MHD
• 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
• An Unsplit Godunov Method for Ideal MHD via Constrained Transport
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-Averaged 900 ks Chandra Grating Spectroscopy
• An Unsplit Godunov Method for Ideal MHD via Constrained Transport in Three Dimensions
• The case for AGN feedback in galaxy groups
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• Black hole feedback in the luminous quasar PDS 456
• Momentum Driving: which physical processes dominate AGN feedback?
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• Feedback from central black holes in elliptical galaxies. III: models with both radiative and mechanical feedback
• Anatomy of the AGN in NGC 5548: I. A global model for the broadband spectral energy distribution
• Radiative Transfer and Acceleration in Magnetocentrifugal Winds
• Warm absorbers in active galactic nuclei
• Variability in Quasar Broad Absorption Line Outflows I. Trends in the Short-Term versus Long-Term Data
• Dynamics of Accretion Flows Irradiated by a Quasar
• Systematic comparison of photoionised plasma codes with application to spectroscopic studies of AGN in X-rays
• A Physical Model of FeLoBALs: Implications for Quasar Feedback
• Variability in quasar broad absorption line outflows II. Multi-epoch monitoring of SiIV and CIV BAL variability
• Confirmation of and Variable Energy Injection by a Near-Relativistic Outflow in APM 08279+5255
• Metal Absorption Lines as Probes of the Intergalactic Medium Prior to the Reionization Epoch
• Was Star-Formation Suppressed in High-Redshift Minihalos?
• 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
• Consequences of Mechanical and Radiative Feedback from Black Holes in Disc Galaxy Mergers
• Three-Dimensional Simulations of Dynamics of Accretion Flows Irradiated by a Quasar
• On the large-scale outflows in active galactic nuclei: consequences of coupling the mass-supply rate and accretion luminosity
• Variable X-ray absorption in the mini-BAL QSO PG 1126-041
• Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey
• Multiphase, non-spherical gas accretion onto a black hole
• TPCI: The PLUTO-CLOUDY Interface
• Line-driven radiative outflows in luminous quasars
• Non-isobaric Thermal Instability
• Thermal Disk Winds in X-ray Binaries: Realistic Heating and Cooling Rates Give Rise to Slow, but Massive Outflows
• A study of the X-rayed outflow of APM 08279+5255 through photoionization codes
• Irradiation of Astrophysical Objects - SED and Flux Effects on Thermally Driven Winds
• The variable, fast soft X-ray wind in PG 1211+143
• A collimated flow driven by radiative pressure from the nucleus of quasar Q~1511+091
• Cloud Formation and Acceleration in a Radiative Environment
• An Intrinsic Absorption Complex Toward RXJ1230.8+0115: Geometry and Photoionization Conditions
• Thermal and dynamical properties of gas accreting onto a supermassive black hole in an AGN
• Continuum Shielding and Flow Dynamics in Active Galactic Nuclei
• Three-Dimensional Simulations of Inflows Irradiated by a Precessing Accretion Disk in Active Galactic Nuclei: Formation of Outflows
• Fe K$\alpha$ Profiles from Simulations of Accreting Black Holes
• Non-Axisymmetric Line Driven Disc Winds II - Full Velocity Gradient
• Narrow Absorption Lines Complex. II. Probing the Line-locking Signatures within the Trough-like Broad Absorption Line
• A new sample of broad-absorption-line quasars exhibiting the ghost of lyman alpha
• Outflowing material in the zem = 4.92 BAL QSO SDSS~J160501.21-011220.0
• IMPETUS: New Cloudy's radiative tables for accretion onto a galaxy black hole

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