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Application of a helicity proxy to edge-on galaxies
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA; Carnegie Mellon University, USA.ORCID iD: 0000-0002-7304-021X
Number of Authors: 22020 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 496, no 4, p. 4749-4759Article in journal (Refereed) Published
Abstract [en]

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 centre of the galaxy and are not a signature of magnetic helicity.

Place, publisher, year, edition, pages
2020. Vol. 496, no 4, p. 4749-4759
Keywords [en]
dynamo, MHD, polarization, turbulence, galaxies: individual: NGC 891, galaxies: magnetic fields
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-187712DOI: 10.1093/mnras/staa1795ISI: 000574923200051OAI: oai:DiVA.org:su-187712DiVA, id: diva2:1510954
Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2022-02-25Bibliographically approved

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Brandenburg, Axel

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