Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mpge.conf..103c&link_type=abstract
The Magnetized Plasma in Galaxy Evolution, Proceedings of the conference held in Kraków, Poland, Sept. 27th - Oct. 1st, 2004, Ed
Physics
3
Scientific paper
Observations of magnetic fields in molecular clouds are essential for understanding their role in the evolution of dense clouds and in the star formation process. I first briefly describe the observational techniques available for such observations -- the Zeeman effect, mapping of polarized dust emission, and mapping of linearly polarized line emission. I then describe an exemplar result, for the high-mass star formation region DR21OH. The data are then used to carry out tests of the two extreme paradigms for what drives star formation -- magnetic and thermal support with ambipolar diffusion, and compressible turbulence with negligible magnetic fields. The conclusion is that the magnetic support model is consistent with the data, but both turbulence and strong magnetic fields are important in the physics of molecular clouds and in the star formation process.
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