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Lookup NU author(s): Dr Andrew Fletcher,
Professor Anvar Shukurov
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Depolarization of diffuse radio synchrotron emission is classified in terms of wavelength-independent and wavelength-dependent depolarization in the context of regular magnetic fields and of both isotropic and anisotropic turbulent magnetic fields. Previous analytical formulas for depolarization due to differential Faraday rotation are extended to include internal Faraday dispersion concomitantly, for a multilayer synchrotron emitting and Faraday rotating magneto-ionic medium. In particular, depolarization equations for a two- and three-layer system (disk-halo, halo-disk-halo) are explicitly derived. To both serve as a "user's guide" to the theoretical machinery and as an approach for disentangling line-of-sight depolarization contributions in face-on galaxies, the analytical framework is applied to data from a small region in the face-on grand-design spiral galaxy M 51. The effectiveness of the multiwavelength observations in constraining the pool of physical depolarization scenarios is illustrated for a two- and three-layer model along with a Faraday screen system for an observationally motivated magnetic field configuration.
Author(s): Shneider C, Haverkorn M, Fletcher A, Shukurov A
Publication type: Article
Publication status: Published
Journal: Astronomy & Astrophysics
Print publication date: 01/07/2014
Online publication date: 14/07/2014
Acceptance date: 04/04/2014
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
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