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QWIND3: UV line-driven accretion disc wind models for AGN feedback

Quera-Bofarull, Arnau; Done, Chris; Lacey, Cedric G; Nomura, Mariko; Ohsuga, Ken

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Authors

Arnau Quera-Bofarull

Mariko Nomura

Ken Ohsuga



Abstract

The ultraviolet (UV) bright accretion disc in active galactic nuclei (AGNs) should give rise to line driving, producing a powerful wind that may play an important role in AGN feedback as well as in producing structures like the broad-line region. However, coupled radiation-hydrodynamic codes are complex and expensive, so we calculate the winds instead using a non-hydrodynamical approach (the QWIND framework). The original QWIND model assumed the initial conditions in the wind, and had only simple radiation transport. Here, we present an improved version that derives the wind initial conditions and has significantly improved ray tracing to calculate the wind absorption self-consistently, given the extended nature of the UV emission. We also correct the radiation flux for relativistic effects and assess the impact of this on the wind velocity. These changes mean the model is more physical, so its predictions are more robust. We find that, even when accounting for relativistic effects, winds can regularly achieve velocities ≃(0.1−0.5)c, and carry mass-loss rates that can be up to 80 per cent of the accreted mass for black hole masses of 107−9 M⊙, and mass accretion rates of 50 per cent of the Eddington rate. Overall, the ratio of kinetic power carried by the wind to bolometric luminosity increases with mass accretion rate at a given black hole mass, unlike the constant fraction generally assumed in current cosmological simulations that include AGN feedback. The updated code, QWIND3, is publicly available in GitHub.

Citation

Quera-Bofarull, A., Done, C., Lacey, C. G., Nomura, M., & Ohsuga, K. (2023). QWIND3: UV line-driven accretion disc wind models for AGN feedback. Monthly Notices of the Royal Astronomical Society, 518(2), 2693-2711. https://doi.org/10.1093/mnras/stac3171

Journal Article Type Article
Acceptance Date Nov 1, 2022
Online Publication Date Nov 29, 2022
Publication Date 2023-01
Deposit Date Jan 25, 2023
Publicly Available Date Jan 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 518
Issue 2
Pages 2693-2711
DOI https://doi.org/10.1093/mnras/stac3171

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an Open Access article distributed under the terms of the Creative<br /> Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium,<br /> provided the original work is properly cited.







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