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

2- The University of Western Ontario); Hua-bai Li (1); Martin Houde (2) (1- Harvard-Smithsonian Center for Astrophysics

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

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arxiv 0801.2757 v1 pith:GSEBPDW4 submitted 2008-01-17 astro-ph

Hua-bai Li (1) , Martin Houde (2) (1- Harvard-Smithsonian Center for Astrophysics , 2- The University of Western Ontario) This is my paper · ORCID

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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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