Structure and evolution of magnetically supported molecular clouds: Evidence for ambipolar diffusion in the Barnard 1 cloud

1994 ◽  
Vol 427 ◽  
pp. 839 ◽  
Author(s):  
R. M. Crutcher ◽  
Telemachos Ch. Mouschovias ◽  
T. H. Troland ◽  
Glenn E. Ciolek
Keyword(s):  
Molecular Clouds ◽  
Ambipolar Diffusion

AMBIPOLAR DIFFUSION AND TURBULENT MAGNETIC FIELDS IN MOLECULAR CLOUDS

2011 ◽  
Vol 26 (04) ◽  
pp. 235-249 ◽  
Author(s):  
MARTIN HOUDE ◽  
TALAYEH HEZAREH ◽  
HUA-BAI LI ◽  
THOMAS G. PHILLIPS
Keyword(s):  
Magnetic Fields ◽  
Molecular Clouds ◽  
Ambipolar Diffusion ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spin Interactions ◽  
Line Narrowing ◽  
Weakly Ionized ◽  
Novel Method

We review the introduction and development of a novel method for the characterization of magnetic fields in star-forming regions. The technique is based on the comparison of spectral line profiles from coexistent neutral and ion molecular species commonly detected in molecular clouds, sites of star formation. Unlike other methods used to study magnetic fields in the cold interstellar medium, this ion/neutral technique is not based on spin interactions with the field. Instead, it relies on and takes advantage of the strong cyclotron coupling between the ions and magnetic fields, thus exposing what is probably the clearest observational manifestation of magnetic fields in the cold, weakly ionized gas that characterizes the interior of molecular clouds. We will show how recent development and modeling of the ensuing ion line narrowing effect leads to a determination of the ambipolar diffusion scale involving the turbulent component of magnetic fields in star-forming regions, as well as the strength of the ordered component of the magnetic field.

scholarly journals Probing the turbulent ambipolar diffusion scale in molecular clouds with spectroscopy

2013 ◽  
Vol 438 (1) ◽  
pp. 663-671 ◽  
Author(s):  
T. Hezareh ◽  
T. Csengeri ◽  
M. Houde ◽  
F. Herpin ◽  
S. Bontemps
Keyword(s):  
Molecular Clouds ◽  
Ambipolar Diffusion ◽  
Diffusion Scale

Grain Alignment by Ambipolar Diffusion in Molecular Clouds

1995 ◽  
Vol 453 ◽  
pp. 238 ◽  
Author(s):  
W. G. Roberge ◽  
S. Hanany ◽  
D. W. Messinger
Keyword(s):  
Molecular Clouds ◽  
Ambipolar Diffusion ◽  
Grain Alignment
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