The distribution of mean and fluctuating magnetic fields in the multi-phase ISM
Cetin Can Evirgen, Frederick Armstrong Gent, Anvar Shukurov, Andrew, Fletcher, Paul Bushby
TL;DR
This study uses MHD simulations to analyze how the multi-phase structure of the ISM influences the distribution of mean and fluctuating magnetic fields, revealing that the mean field mainly exists in the warm phase.
Contribution
It provides new insights into the phase-dependent distribution of magnetic fields in the ISM using detailed simulations.
Findings
Mean magnetic field predominantly in warm phase
Hot phase largely lacks mean magnetic field
Fluctuating magnetic field less sensitive to phase structure
Abstract
We explore the effects of the multi-phase structure of the interstellar medium (ISM) on galactic magnetic fields. Basing our analysis on compressible magnetohydrodynamic (MHD) simulations of supernova-driven turbulence in the ISM, we investigate the properties of both the mean and fluctuating components of the magnetic field. We find that the mean magnetic field preferentially resides in the warm phase and is generally absent from the hot phase. The fluctuating magnetic field does not show such pronounced sensitivity to the multi-phase structure.
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