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Ambipolar diffusion and turbulent magnetic fields in molecular clouds

Houde, Martin and Hezareh, Talayeh and Li, Hua-Bai and Phillips, Thomas G. (2011) Ambipolar diffusion and turbulent magnetic fields in molecular clouds. Modern Physics Letters A, 26 (4). pp. 235-249. ISSN 0217-7323. http://resolver.caltech.edu/CaltechAUTHORS:20110302-102608832

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1142/S021773231103502XDOIUNSPECIFIED
http://www.worldscinet.com/mpla/26/2604/S021773231103502X.htmlPublisherUNSPECIFIED
Additional Information:© 2011 World Scientific Publishing Company. Received 20 December 2010. We thank R. H. Hildebrand for insightful discussions and his encouragement while pursuing this line of research. M.H.’s research is funded through the NSERC Discovery Grant, Canada Research Chair, Canada Foundation for Innovation, Ontario Innovation Trust, and Western’s Academic Development Fund programs. The Caltech Submillimeter Observatory is funded through the NSF grant AST-0540882 to the California Institute of Technology.
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant UNSPECIFIED
Canada Research ChairUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Innovation TrustUNSPECIFIED
Western’s Academic Development Fund programsUNSPECIFIED
NSFAST-0540882
Subject Keywords:Molecular clouds; interstellar magnetic fields; interstellar turbulence
Record Number:CaltechAUTHORS:20110302-102608832
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110302-102608832
Official Citation:AMBIPOLAR DIFFUSION AND TURBULENT MAGNETIC FIELDS IN MOLECULAR CLOUDS MARTIN HOUDE, TALAYEH HEZAREH, HUA-BAI LI and THOMAS G. PHILLIPS DOI No: 10.1142/S021773231103502X Page: 235-249
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22600
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Mar 2011 18:07
Last Modified:03 Mar 2011 18:07

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