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ID 116243
Title Alternative
Helicity proxy for edge-on galaxies
Author
Brandenburg, Axel KTH Royal Institute of Technology and Stockholm University|Stockholm University|University of Colorado|Carnegie Mellon University
Keywords
dynamo –MHD– polarization – turbulence – galaxies
individual
NGC 891 – galaxies
magnetic fields
Content Type
Journal Article
Description
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.
Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
13652966
Publisher
Oxford University Press|The Royal Astronomical Society
Volume
496
Issue
4
Start Page
4749
End Page
4759
Published Date
2020-06-29
Rights
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Liberal Arts and Sciences