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Dispersion of Magnetic Fields in Molecular Clouds. IV - Analysis of Interferometry Data

Houde, Martin and Hull, Charles L. H. and Plambeck, Richard L. and Vaillancourt, John E. and Hildebrand, Roger H. (2016) Dispersion of Magnetic Fields in Molecular Clouds. IV - Analysis of Interferometry Data. Astrophysical Journal, 820 (1). Art. No. 38. ISSN 0004-637X.

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We expand on the dispersion analysis of polarimetry maps toward applications to interferometry data. We show how the filtering of low spatial frequencies can be accounted for within the idealized Gaussian turbulence model, initially introduced for single-dish data analysis, to recover reliable estimates for correlation lengths of magnetized turbulence, as well as magnetic field strengths (plane-of-the-sky component) using the Davis–Chandrasekhar–Fermi method. We apply our updated technique to TADPOL/CARMA data obtained on W3(OH), W3 Main, and DR21(OH). For W3(OH), our analysis yields a turbulence correlation length δ ≃ 19 mpc, a ratio of turbulent-to-total magnetic energy 〈B〉_^2_t/〈B^2〉 ≃ 0.58, and a magnetic field strength B_0 ~ 1.1 mG for W3 Main δ ≃ 22mpc, 〈B_t^2〉/〈B^2〉 ≃ 0.74, and B_0 ~ 0.7 mG while for DR21(OH) δ ≃ 12 mpc, 〈B_t^2〉/〈B^2〉 ≃ 0.70, and B_0 ~ 1.2 mG.

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Additional Information:© 2016 The American Astronomical Society. Received 2015 November 25; accepted 2016 February 4; published 2016 March 16. M.H.ʼs research is funded through the NSERC Discovery Grant, Canada Research Chair, Canada Foundation for Innovation, Ontario Innovation Trust, and Western’s Academic Development Fund programs. CARMA development and operations were funded by the National Science Foundation and the CARMA partner universities.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Research ChairUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Innovation TrustUNSPECIFIED
Western’s Academic Development FundUNSPECIFIED
CARMA partner universitiesUNSPECIFIED
Subject Keywords:ISM: clouds; ISM: magnetic fields; polarization; turbulence
Issue or Number:1
Record Number:CaltechAUTHORS:20160427-082023011
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Official Citation:Martin Houde et al 2016 ApJ 820 38
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66497
Deposited By: Ruth Sustaita
Deposited On:27 Apr 2016 16:07
Last Modified:03 Oct 2019 09:57

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