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Hemispheric Handedness in the Galactic Synchrotron Polarization Foreground
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: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 896, no 1, article id L14Article in journal (Refereed) Published
Abstract [en]

The large-scale magnetic field of the Milky Way is thought to be created by an alpha omega dynamo, which implies that it should have opposite handedness north and south of the Galactic midplane. Here we attempt to detect a variation in handedness using polarization data from the Wilkinson Microwave Anisotropy Probe. Previous analyzes of the parity-even and parity-odd parts of linear polarization of the global dust and synchrotron emission have focused on quadratic correlations in spectral space of, and between, these two components. Here, by contrast, we analyze the parity-odd polarization itself and show that it has, on average, opposite signs in northern and southern Galactic hemispheres. Comparison with a Galactic mean-field dynamo model shows broad qualitative agreement and reveals that the sign of the observed hemispheric dependence of the azimuthally averaged parity-odd polarization is not determined by the sign of alpha, but by the sense of differential rotation.

Place, publisher, year, edition, pages
2020. Vol. 896, no 1, article id L14
Keywords [en]
Galaxy magnetic fields
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-183541DOI: 10.3847/2041-8213/ab974aISI: 000541741200001OAI: oai:DiVA.org:su-183541DiVA, id: diva2:1455734
Available from: 2020-07-28 Created: 2020-07-28 Last updated: 2022-02-26Bibliographically approved

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Brandenburg, Axel

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