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Open AccessArticle

Combining Faraday Tomography and Wavelet Analysis

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Department of Physics, Moscow University, 119992 Moscow, Russia
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Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Kaluzhskoe Hwy 4, Troitsk, 108840 Moscow, Russia
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MPI für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
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Institute of Continuous Media Mechanics, Korolyov str. 1, 614061 Perm, Russia
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Department of Mechanics and Mathematics, Perm State National Research University, Bukirev str. 15, 614990 Perm, Russia
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Department of General Physics, Perm State National Research University, Bukirev str. 15, 614990 Perm, Russia
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CSIRO Astronomy and Space Science, P.O. Box 1130, Bentley, WA 6102, Australia
*
Author to whom correspondence should be addressed.
Galaxies 2018, 6(4), 121; https://doi.org/10.3390/galaxies6040121
Received: 3 October 2018 / Revised: 16 November 2018 / Accepted: 19 November 2018 / Published: 22 November 2018
(This article belongs to the Special Issue The Power of Faraday Tomography)
We present a concept for using long-wavelength broadband radio continuum observations of spiral galaxies to isolate magnetic structures that were only previously accessible from short-wavelength observations. The approach is based on combining the RM Synthesis technique with the 2D continuous wavelet transform. Wavelet analysis helps to isolate and recognize small-scale structures which are produced by Faraday dispersion. We find that these structures can trace galactic magnetic arms as illustrated by the case of the galaxy NGC 6946 observed at λ = 17 22 cm. We support this interpretation through the analysis of a synthetic observation obtained using a realistic model of a galactic magnetic field. View Full-Text
Keywords: galactic magnetic field; RM-synthesis; faraday depolarization; wavelet analysis galactic magnetic field; RM-synthesis; faraday depolarization; wavelet analysis
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Sokoloff, D.; Beck, R.; Chupin, A.; Frick, P.; Heald, G.; Stepanov, R. Combining Faraday Tomography and Wavelet Analysis. Galaxies 2018, 6, 121.

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