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

Martin Houde; Charles L. H. Hull; Richard L. Plambeck; John E. Vaillancourt; Roger H. Hildebrand

doi:10.3847/0004-637X/820/1/38

paper

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

arXiv:1602.01873 · doi:10.3847/0004-637X/820/1/38

Abstract

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 $⟨ B_{t}^{2} ⟩ / ⟨ B^{2} ⟩ ≃ 0.58$ , and a magnetic field strength $B_{0} \sim 1.1 mG$ ; for W3 Main $δ ≃ 22$ mpc, $⟨ B_{t}^{2} ⟩ / ⟨ B^{2} ⟩ ≃ 0.74$ , and $B_{0} \sim 0.7 mG$ ; while for DR21(OH) $δ ≃ 12$ mpc, $⟨ B_{t}^{2} ⟩ / ⟨ B^{2} ⟩ ≃ 0.70$ , and $B_{0} \sim 1.2 mG$ .

27 pages, 9 figures, 2 tables; accepted for ApJ

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

Abstract

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