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

A. Fletcher; A. Shukurov; C. C. Evirgen; F. A. Gent; P. J. Bushby

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

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arxiv 1903.10263 v2 pith:O3JGZV6K submitted 2019-03-25 astro-ph.GA

C. C. Evirgen , F. A. Gent , A. Shukurov , A. Fletcher , P. J. Bushby This is my paper · ORCID

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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| $\approx$ 300 pc causes a downward pressure gradient below the maximum which acts against outflow driven by SN explosions, while it provides pressure support above the maximum.

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MHD supernova explosions -- Large-scale magnetic field effects
astro-ph.HE 2019-08 conditional novelty 6.0 of 10

A uniform magnetic field above about 1 microgauss makes supernova remnants expand faster perpendicular to the field, reduces outward momentum by up to 10 percent, and can increase residual energy injection by up to 40...

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