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Galaxies 2018, 6(4), 121;

Combining Faraday Tomography and Wavelet Analysis

Department of Physics, Moscow University, 119992 Moscow, Russia
Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Kaluzhskoe Hwy 4, Troitsk, 108840 Moscow, Russia
MPI für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Institute of Continuous Media Mechanics, Korolyov str. 1, 614061 Perm, Russia
Department of Mechanics and Mathematics, Perm State National Research University, Bukirev str. 15, 614990 Perm, Russia
Department of General Physics, Perm State National Research University, Bukirev str. 15, 614990 Perm, Russia
CSIRO Astronomy and Space Science, P.O. Box 1130, Bentley, WA 6102, Australia
Author to whom correspondence should be addressed.
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)
Full-Text   |   PDF [2525 KB, uploaded 26 November 2018]   |  


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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