Radiation-driven outflows in AGNs: revisiting feedback effects of scattered and reprocessed photons

Mosallanezhad, Amin; Yuan, Feng; Ostriker, Jeremiah P.; Zeraatgari, Fatemeh Zahra; Bu, De-Fu

doi:10.1093/mnras/stz2758

Cited by 11 publications

(17 citation statements)

References 64 publications

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“…For the particular case of PG1211+143 it was found that the mass outflow rates of the windsṀ out ∼ 1.6M ⊙ yr −1 was comparable to the Eddington accretion rate, implying a radiatively driven accretion disk wind. Recent 2D hydrodynamical simulations have also considered the re-radiation photons (locally produced radiation by Thompson scattering and Bremsstrahlung radiation), which resulted in a better match with observed properties of the outflows (Mosallanezhad et al 2019).…”

Section: The Origin and Acceleration Mechanisms Of The Ionized Outflowsmentioning

confidence: 99%

Ionized outflows from active galactic nuclei as the essential elements of feedback

et al. 2020

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Outflows from active galactic nuclei (AGN) are one of the fundamental mechanisms by which the central supermassive black hole interacts with its host galaxy. Detected in ≥ 50% of nearby AGN, these outflows have been found to carry kinetic energy that is a significant fraction of AGN power, and thereby give 'negative' feedback to their host galaxies. To understand the physical processes that regulate them, it is important to have a robust estimate of their physical and dynamical parameters. In this review we summarize our current understanding on the physics of the ionized outflows detected in absorption in the UV and X-ray wavelength bands. We discuss the most relevant observations and our current knowledge and uncertainties in the measurements of the outflow parameters. We also discuss their origin and acceleration mechanisms. The commissioning and concept studies of large telescope missions with high resolution spectrographs in UV/optical and X-rays along with rapid advancements in simulations offer great promise for discoveries in this field over the next decade.

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Section: The Origin and Acceleration Mechanisms Of The Ionized Outflowsmentioning

confidence: 99%

Ionized outflows from active galactic nuclei as the essential elements of feedback

et al. 2020

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“…However, all studies based on radiation pressure so far have not used a realistic prescription of radiation field of the AD. Either the disk has been initially treated as a spherical isotropic point-like source with luminosity L (Mosallanezhad et al 2019), or it was approximated applying azimuthally symmetric integration of luminosity over an extended disk so finally the radiation source is centered again at the origin as a point-like source (Risaliti & Elvis 2010). Both cases yield the radiation field to be proportional to the inverse square of the radial distance (with a factor of cos θ for the matter of anisotropy).…”

Section: Introductionmentioning

confidence: 99%

The picture of BLR in 2.5-D FRADO: Dynamics & Geometry

Naddaf,

Czerny,

Szczerba

2021

Preprint

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The dynamics of the Broad Line Region (BLR) in Active galaxies is an open question, direct observational constraints suggests a predominantly Keplerian motion, with possible traces of inflow or outflow. In this paper we study in detail the physically motivated BLR model of Czerny & Hryniewicz (2011) based on the radiation pressure acting on dust at the surface layers of accretion disk (AD). We consider here the realistic prescription of radiation coming from the entire AD acting on a dusty cloud. We use here the realistic description of the dust opacity, and we introduce two simple geometrical models of the local shielding of the dusty cloud. We show that the radiation pressure acting on dusty clouds is strong enough to lead to dynamical outflow from the AD surface, so the BLR has a dynamical character of (mostly failed) outflow. The dynamics strongly depend on the Eddington ratio of the source. Large Eddington ratio sources show a complex velocity field and large vertical velocities with respect to the AD surface, while for lower Eddington ratio sources vertical velocities are small and most of the emission originates close to the AD surface. Cloud dynamics thus determines the 3-D geometry of the BLR.

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“…Both the photons from the central AGNs and those locally produced can exert radiation force on the gas (Liu et al 2013;Mosallanezhad et al 2019). The total radiation force includes the radiation force F c r from the center AGNs and the re-radiation force F re z due to the locally produced photons,…”

Section: The Radiation Forcementioning

confidence: 99%

“…They find that the accretion flows properties change significantly due to the re-radiation effect and outflows become stronger consequently. Mosallanezhad et al (2019) improve the calculation of radiation force due to the Thomson scattering of Xray photons and the re-radiation force due to locally process. They find that the mass flux and velocity of the outflows are significantly increased.…”

Section: Introductionmentioning

confidence: 99%

Large-scale Dynamics of Radiation Driven Winds with the Re-radiation Effect

Yang

2022

Preprint

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Note: Please see pdf for full abstract with equations. Previous simulations studying winds only focus on the line force due to the photons from the central active galactic nucleis (AGNs). What the properties of the winds will be when including the re-radiation force due to the scattered and reprocessed photons (i.e., the re-radiation effect)? We perform simulations to study the large-scale dynamics of accretion disk winds driven by radiation line force and re-radiation force. We find that the re-radiation force drives stronger winds during the early stages. When the flows get into the steadiness, the injected winds command a decisive advantage and the re-radiation effect could be negligible. The opening angle of winds narrows as initial gas density increases. The larger the gas density is, the stronger the re-radiation effect will be. For MBH=106Mo, ε=0.3, the outflows do become much stronger with the re-radiation effect and the winds still can not escape from gravitational potential. We find that the detection probability of ultra-fast outflows (UFOs) and the properties of the winds are both consistent with the observations.

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Radiation-driven outflows in AGNs: revisiting feedback effects of scattered and reprocessed photons

Cited by 11 publications

References 64 publications

Ionized outflows from active galactic nuclei as the essential elements of feedback

Ionized outflows from active galactic nuclei as the essential elements of feedback

The picture of BLR in 2.5-D FRADO: Dynamics & Geometry

Large-scale Dynamics of Radiation Driven Winds with the Re-radiation Effect

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