Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds

Details Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds

2008-01-17

arxiv.org/abs/0801.2757v1

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures, accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/529581

We study the turbulent velocity dispersion spectra of the coexistent HCN and HCO+ molecular species as a function of length scale in the M17 star-forming molecular cloud. We show that the observed downward shift of the ion's spectrum relative to that of the neutral is readily explained by the existence of an ambipolar diffusion range within which ion and neutral turbulent energies dissipate differently. We use these observations to evaluate this decoupling scale and show how to estimate the strength of the plane-of-the-sky component of the embedded magnetic field in a completely novel way.

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