The critical role of clumping in line-driven disc winds
The critical role of clumping in line-driven disc winds
Radiation pressure on spectral lines is a promising mechanism for powering disc winds from accreting white dwarfs (AWDs)and active galactic nuclei (AGN). However, in radiation-hydrodynamic simulations, overionization reduces line opacity and quenches the line force, which suppresses outflows. Here, we show that small-scale clumping can resolve this problem. Adopting the micro clumping approximation, our new simulations demonstrate that even modest volume filling factors (
astro-ph.GA, astro-ph.HE
Mosallanezhad, Amin
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Knigge, Christian
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Scepi, Nicolas
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Long, Knox S.
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Matthews, James H.
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Sim, Stuart A.
67bb8102-b981-4e2e-9617-8c7806ef1329
Wallis, Austen
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29 December 2025
Mosallanezhad, Amin
4b0cff0a-4de1-4359-9d86-eadaa3da64ba
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Scepi, Nicolas
c1216996-687d-42b1-8a9c-1d93f27e4230
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Matthews, James H.
f4c0d721-d3e0-46cf-a50f-58aec5ab07ea
Sim, Stuart A.
67bb8102-b981-4e2e-9617-8c7806ef1329
Wallis, Austen
0e70d41d-ced3-473d-89b0-c2248bc1fed6
Mosallanezhad, Amin, Knigge, Christian, Scepi, Nicolas, Long, Knox S., Matthews, James H., Sim, Stuart A. and Wallis, Austen
(2025)
The critical role of clumping in line-driven disc winds.
Monthly Notices of the Royal Astronomical Society, 545 (3).
(doi:10.1093/mnras/staf2183).
Abstract
Radiation pressure on spectral lines is a promising mechanism for powering disc winds from accreting white dwarfs (AWDs)and active galactic nuclei (AGN). However, in radiation-hydrodynamic simulations, overionization reduces line opacity and quenches the line force, which suppresses outflows. Here, we show that small-scale clumping can resolve this problem. Adopting the micro clumping approximation, our new simulations demonstrate that even modest volume filling factors (
Text
2512.05029v1
- Author's Original
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staf2183
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Accepted/In Press date: 2 December 2025
e-pub ahead of print date: 9 December 2025
Published date: 29 December 2025
Keywords:
astro-ph.GA, astro-ph.HE
Identifiers
Local EPrints ID: 509769
URI: http://eprints.soton.ac.uk/id/eprint/509769
ISSN: 1365-2966
PURE UUID: 1959ad34-3409-4b54-82f0-b7997f4671f5
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Date deposited: 04 Mar 2026 17:51
Last modified: 05 Mar 2026 03:04
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Contributors
Author:
Amin Mosallanezhad
Author:
Nicolas Scepi
Author:
Knox S. Long
Author:
James H. Matthews
Author:
Stuart A. Sim
Author:
Austen Wallis
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