Other
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mim..proc..123c&link_type=abstract
The Magnetized Interstellar Medium, Proceedings of the conference, held in Antalya, Turkey, September 8 - 12, 2003, Eds: B. Uyan
Other
8
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. The predictions of two extreme paradigms for what drives star formation - magnetic and thermal support with ambipolar diffusion, and compressible turbulence with negligible magnetic fields - are first discussed in order to formulate three tests of the two models that can be applied using observations of magnetic field strengths and morphologies. Techniques for measuring magnetic fields in molecular clouds are described. Three examples of the observational results are discussed here - the low-mass starless core L 183, the young stellar system and molecular outflow NGC 1333 IRAS4A, and the high-mass star formation region DR 21 (OH). Finally, these and all other results of observations of magnetic fields in molecular clouds are used to apply the three tests. 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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