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Title:
Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
Authors:
Li, Hua-bai; Houde, Martin
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; ), AB(Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada; )
Publication:
The Astrophysical Journal, Volume 677, Issue 2, pp. 1151-1156. (ApJ Homepage)
Publication Date:
04/2008
Origin:
UCP
ApJ Keywords:
ISM: Clouds, ISM: Individual: Messier Number: M17, ISM: Magnetic Fields, Turbulence
DOI:
10.1086/529581
Bibliographic Code:
2008ApJ...677.1151L

Abstract

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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