Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow

Done, Chris; Ohsuga, Ken; Nomura, Mariko

doi:10.1093/mnras/staa948

Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow

Done, Chris; Ohsuga, Ken; Nomura, Mariko

Authors

Professor Christine Done chris.done@durham.ac.uk
Professor

Ken Ohsuga

Mariko Nomura

Abstract

Based on recent X-ray observations, ultra-fast outflows from supermassive black holes are expected to have enough energy to dramatically affect their host galaxy but their launch and acceleration mechanisms are not well understood. We perform two-dimensional radiation hydrodynamics simulations of UV line-driven disc winds in order to calculate the mass loss rates and kinetic power in these models. We develop a new iterative technique which reduces the mass accretion rate through the inner disc in response to the wind mass loss. This makes the inner disc is less UV bright, reducing the wind power compared to previous simulations which assumed a constant accretion rate with radius. The line-driven winds in our simulations are still extremely powerful, with around half the supplied mass accretion rate being ejected in the wind for black holes with mass 108–1010 M⊙ accreting at L/LEdd = 0.5–0.9. Our results open up the way for estimating the growth rate of supermassive black hole and evaluating the kinetic energy ejected into the inter stellar medium (active galactic nuclei feedback) based on a physical model of line-driven disc winds.

Citation

Done, C., Ohsuga, K., & Nomura, M. (2020). Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow. Monthly Notices of the Royal Astronomical Society, 494(3), 3616-3626. https://doi.org/10.1093/mnras/staa948

Journal Article Type	Article
Acceptance Date	Mar 31, 2020
Online Publication Date	Apr 11, 2020
Publication Date	May 31, 2020
Deposit Date	Apr 11, 2020
Publicly Available Date	Apr 11, 2020
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	494
Issue	3
Pages	3616-3626
DOI	https://doi.org/10.1093/mnras/staa948

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Copyright 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.