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Dispersion of Magnetic Fields in Molecular Clouds. III.

Houde, Martin and Rao, Ramprasad and Vaillancourt, John E. and Hildebrand, Roger H. (2011) Dispersion of Magnetic Fields in Molecular Clouds. III. Astrophysical Journal, 733 (2). Art. No. 109. ISSN 0004-637X.

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We apply our technique on the dispersion of magnetic fields in molecular clouds to high spatial resolution Submillimeter Array polarization data obtained for Orion KL in OMC-1, IRAS 16293, and NGC 1333 IRAS 4A. We show how one can take advantage of such high-resolution data to characterize the magnetized turbulence power spectrum in the inertial and dissipation ranges. For Orion KL we determine that in the inertial range the spectrum can be approximately fitted with a power law k^(–(2.9 ± 0.9)) and we report a value of 9.9 mpc for λ_(AD), the high spatial frequency cutoff presumably due to turbulent ambipolar diffusion. For the same parameters we have ~k^(–(1.4 ± 0.4)) and a tentative value of λ_(AD) ≃2.2 mpc for NGC 1333 IRAS 4A, and ~k^(-(1.8 ± 0.3)) with an upper limit of λ_(AD) ≾ 1.8 mpc for IRAS 16293. We also discuss the application of the technique to interferometry measurements and the effects of the inherent spatial filtering process on the interpretation of the results.

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Additional Information:© 2011 The American Astronomical Society. Received 2010 October 05; accepted 2011 March 24; published 2011 May 12. The authors thank the referee, P. M. Koch, for his valuable comments, which greatly improved this paper. M.H.’s 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.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery GrantUNSPECIFIED
Canada Research ChairUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Innovation TrustUNSPECIFIED
Western's Academic Development Fund programsUNSPECIFIED
Subject Keywords:ISM: clouds; ISM: magnetic fields; polarization; turbulence
Issue or Number:2
Classification Code:PACS: 98.38.Dq; 98.38.Am; 95.30.Gv
Record Number:CaltechAUTHORS:20110607-082256872
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Official Citation:Dispersion of Magnetic Fields in Molecular Clouds. III. Martin Houde, Ramprasad Rao, John E. Vaillancourt and Roger H. Hildebrand doi: 10.1088/0004-637X/733/2/109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23921
Deposited By: Ruth Sustaita
Deposited On:07 Jun 2011 15:41
Last Modified:03 Oct 2019 02:51

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