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Qwind code release : a non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei.

Elvis, Martin and Risaliti, Guido and McDowell, Jonathan C. and Lacey, Cedric and Done, Chris and Quera-Bofarull, Arnau (2020) 'Qwind code release : a non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei.', Monthly notices of the Royal Astronomical Society., 495 (1). pp. 402-412.

Abstract

UV line driven winds may be an important part of the AGN feedback process, but understanding their impact is hindered by the complex nature of the radiation hydrodynamics. Instead, we have taken the approach pioneered by Risaliti & Elvis, calculating only ballistic trajectories from radiation forces and gravity, but neglecting gas pressure. We have completely re-written their QWIND code using more robust algorithms, and can now quickly model the acceleration phase of these winds for any AGN spectral energy distribution spanning UV and X-ray wavebands. We demonstrate the code using an AGN with black hole mass 108 M⊙ emitting at half the Eddington rate and show that this can effectively eject a wind with velocities ≃ (0.1 − 0.2) c. The mass loss rates can be up to ≃ 0.3M⊙ per year, consistent with more computationally expensive hydrodynamical simulations, though we highlight the importance of future improvements in radiation transfer along the multiple different lines of sight illuminating the wind. The code is fully public, and can be used to quickly explore the conditions under which AGN feedback can be dominated by accretion disc winds.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/staa1117
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s) . Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:20 April 2020
Date deposited:05 May 2020
Date of first online publication:30 April 2020
Date first made open access:05 May 2020

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