Other
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mim..proc..105t&link_type=abstract
The Magnetized Interstellar Medium, Proceedings of the conference, held in Antalya, Turkey, September 8 - 12, 2003, Eds: B. Uyan
Other
1
Scientific paper
Observations of magnetic fields in the diffuse ISM of the Galaxy offer important insights into the physics of this gas, and they may provide clues to the processes that transform one phase into another. Here we review the physical nature of the diffuse ISM, concentrating on HI in the CNM and WNM. We also describe the Arecibo Millennium HI absorption survey of Heiles & Troland, highlighting its new observational and data analysis techniques. The results of this survey establish that the median magnetic field strength in the CNM is about 5 μG, very similar to other field strength measurements in less dense and in more dense gas. The absence of any obvious correlation between field strength and gas density for densities ≤ 103 cm-3 is now on firm statistical grounds. Understanding this phenomenon presents interesting opportunities for theoretical work. Nonetheless, the magnetic field in the CNM is hardly irrelevant. Its energy is comparable to turbulent energies. Also, the mass-to-flux ratio in this gas is largely subcritical. If this ratio is preserved as the gas becomes self-gravitating, then the magnetic field will be important to subsequent evolution and star formation within the gas.
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