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Title:
Dispersion of Magnetic Fields in Molecular Clouds. II.
Authors:
Houde, Martin; Vaillancourt, John E.; Hildebrand, Roger H.; Chitsazzadeh, Shadi; Kirby, Larry
Affiliation:
AA(Department of Physics and Astronomy, The University of Western Ontario, London, ON, N6A 3K7, Canada ), AB(Division of Physics, Mathematics, & Astronomy, California Institute of Technology, Pasadena, CA 91125, USA ), AC(Department of Astronomy and Astrophysics and Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA ; Department of Physics, The University of Chicago, Chicago, IL 60637, USA), AD(Department of Physics and Astronomy, The University of Western Ontario, London, ON, N6A 3K7, Canada ), AE(Department of Astronomy and Astrophysics and Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA )
Publication:
The Astrophysical Journal, Volume 706, Issue 2, pp. 1504-1516 (2009). (ApJ Homepage)
Publication Date:
12/2009
Origin:
IOP
ApJ Keywords:
ISM: clouds, ISM: magnetic fields, polarization, turbulence
DOI:
10.1088/0004-637X/706/2/1504
Bibliographic Code:
2009ApJ...706.1504H

Abstract

We expand our study on the dispersion of polarization angles in molecular clouds. We show how the effect of signal integration through the thickness of the cloud as well as across the area subtended by the telescope beam inherent to dust continuum measurements can be incorporated in our analysis to correctly account for its effect on the measured angular dispersion and inferred turbulent to large-scale magnetic field strength ratio. We further show how to evaluate the turbulent magnetic field correlation scale from polarization data of sufficient spatial resolution and high enough spatial sampling rate. We apply our results to the molecular cloud OMC-1, where we find a turbulent correlation length of δ ≈ 16 mpc, a turbulent to large-scale magnetic field strength ratio of approximately 0.5, and a plane-of-the-sky large-scale magnetic field strength of approximately 760 μG.
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