Tracing Turbulent Ambipolar Diffusion in Molecular Clouds

Details Tracing Turbulent Ambipolar Diffusion in Molecular Clouds Tracing Turbulent Ambipolar Diffusion in Molecular Clouds

2010-03-15

arxiv.org/abs/1003.2919v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted by ApJ

Scientific paper

Though flux freezing is a good approximation frequently assumed for molecular clouds, ambipolar diffusion (AD) is inevitable at certain scales. The scale at which AD sets in can be a crucial parameter for turbulence and the star formation process. However, both observation and simulation of AD are very challenging and our knowledge of it is very limited. We proposed earlier (Li and Houde 2008) that the difference between ion and neutral velocity spectra is a signature of turbulent AD and can be used to estimate the AD scales and magnetic field strength. Here we present observational evidence showing that this difference between the velocity dispersions from coexistent ions and neutrals is indeed correlated with magnetic field strength.

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