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The supernova-regulated ISM – VI. Magnetic effects on the structure of the interstellar medium

Lookup NU author(s): Can Evirgen, Professor Anvar Shukurov, Dr Andrew Fletcher, Dr Paul Bushby

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Oxford University Press, 2019.

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Abstract

We explore the effect of magnetic fields on the vertical distribution and multiphase structure of the supernova-driven interstellar medium (ISM) in simulations that admit dynamo action. As the magnetic field is amplified to become dynamically significant, gas becomes cooler and its distribution in the disc becomes more homogeneous. We attribute this to magnetic quenching of vertical velocity, which leads to a decrease in the cooling length of hot gas. A non-monotonic vertical distribution of the large-scale magnetic field strength, with the maximum at |z| ≈ 300 pc causes a downward pressuregradient below the maximum which acts against outflow driven by SN explosions, while it provides pressure support above the maximum.


Publication metadata

Author(s): Evirgen CC, Gent FA, Shukurov A, Fletcher A, Bushby PJ

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2019

Volume: 488

Issue: 4

Pages: 5065–5074

Print publication date: 01/10/2019

Online publication date: 30/07/2019

Acceptance date: 24/07/2019

Date deposited: 29/07/2019

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press

URL: https://doi.org/10.1093/mnras/stz2084

DOI: 10.1093/mnras/stz2084


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