Lookup NU author(s): Dr Andrew Fletcher
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We use previously published high-resolution synchrotron polarization data to perform an angular dispersion analysis with the aim of characterizing magnetized turbulence in M51. We first analyze three distinct regions (the center of the galaxy, and the northwest and southwest spiral arms) and can clearly discern the turbulent correlation length scale from the width of the magnetized turbulent correlation function for two regions and detect the imprint of anisotropy in the turbulence for all three. Furthermore, analyzing the galaxy as a whole allows us to determine a two-dimensional Gaussian model for the magnetized turbulence in M51. We measure the turbulent correlation scales parallel and perpendicular to the local mean magnetic field to be, respectively, δ|| = 98 ± 5 pc and δ⊥ = 54 ± 3 pc, while the turbulent-to-ordered magnetic field strength ratio is found to be B t/B 0 = 1.01 ± 0.04. These results are consistent with those of Fletcher et al., who performed a Faraday rotation dispersion analysis of the same data, and our detection of anisotropy is consistent with current magnetized turbulence theories.
Author(s): Houde M, Fletcher A, Beck R, Hildebrand RH, Vaillancourt JE, Stil JM
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal
Print publication date: 20/03/2013
ISSN (print): 0004-637X
ISSN (electronic): 1538-4357
Publisher: Institute of Physics Publishing, Inc.
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