Preprint Article Version 1 This version is not peer-reviewed

# Combining Faraday Tomography and Wavelet Analysis

Version 1 : Received: 3 October 2018 / Approved: 4 October 2018 / Online: 4 October 2018 (15:27:30 CEST)

A peer-reviewed article of this Preprint also exists.

Sokoloff, D.; Beck, R.; Chupin, A.; Frick, P.; Heald, G.; Stepanov, R. Combining Faraday Tomography and Wavelet Analysis. Galaxies 2018, 6, 121. Sokoloff, D.; Beck, R.; Chupin, A.; Frick, P.; Heald, G.; Stepanov, R. Combining Faraday Tomography and Wavelet Analysis. Galaxies 2018, 6, 121.

Journal reference: Galaxies 2018, 6, 121
DOI: 10.3390/galaxies6040121

## Abstract

We present an idea how to use long-wavelength multi-wavelength radio continuum observations of spiral galaxies to isolate magnetic structures which were previously accessible from short-wavelength observations only. The approach is based on the RM-synthesis and 2D continuous wavelet transform. Wavelet analysis helps to recognize a configuration of small-scale structures which are produced by Faraday dispersion. We find that these structures can trace galactic magnetic arms for the case of the galaxy NGC 6946 observed at $\lambda = 17 \div 22$~cm. We support this interpretation by an analysis of a synthetic observation obtained using a realistic model of a galactic magnetic field.

## Subject Areas

galactic magnetic field; RM-synthesis; Faraday depolarization; wavelet analysis