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Characterizing Magnetized Turbulence in M51

Houde, Martin and Fletcher, Andrew and Beck, Rainer and Hildebrand, Roger H. and Vaillancourt, John E. and Stil, Jeroen M. (2013) Characterizing Magnetized Turbulence in M51. Astrophysical Journal, 766 (1). Art. No. 49. ISSN 0004-637X. doi:10.1088/0004-637X/766/1/49.

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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_ǁ = 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.

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Additional Information:© 2013 American Astronomical Society. Received 2012 July 21; accepted 2013 January 30; published 2013 March 6. M.H.’s research is funded through the NSERC Discovery Grant, Canada Research Chair, and Western’s Academic Development Fund programs.
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Canada Research ChairUNSPECIFIED
Western’s Academic Development Fund programsUNSPECIFIED
Subject Keywords:galaxies: individual (M51); galaxies: ISM; galaxies: magnetic fields; galaxies: spiral
Issue or Number:1
Record Number:CaltechAUTHORS:20130412-094424544
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Official Citation:Characterizing Magnetized Turbulence in M51 Martin Houde et al. 2013 ApJ 766 49
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37903
Deposited By: Ruth Sustaita
Deposited On:12 Apr 2013 17:11
Last Modified:09 Nov 2021 23:32

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