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arXiv · 2003.07284

Application of a helicity proxy to edge-on galaxies

Axel Brandenburg·Ray S. Furuya
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Abstract

We study the prospects of detecting magnetic helicity in galaxies by observing the dust polarization of the edge-on galaxy NGC 891. Our numerical results of mean-field dynamo calculations show that there should be a large-scale component of the rotationally invariant parity-odd B polarization that we predict to be negative in the first and third quadrants, and positive in the second and fourth quadrants. The large-scale parity-even E polarization is predicted to be negative near the axis and positive further away in the outskirts. These properties are shown to be mostly a consequence of the magnetic field being azimuthal and the polarized intensity being maximum at the center of the galaxy and are not a signature of magnetic helicity.

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Axel Brandenburg, Ray S. Furuya. 2020-06-17. Application of a helicity proxy to edge-on galaxies. https://doi.org/10.1093/mnras%2Fstaa1795

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