Mathematics – Logic
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..808h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 15, 1989, p. 808-821. Research supported by NSF.
Mathematics
Logic
83
H I Regions, Interstellar Gas, Interstellar Magnetic Fields, Emission Spectra, Faraday Effect, Gas Pressure, Signal To Noise Ratios, Thermal Stability, Zeeman Effect
Scientific paper
B(parallel) from the Zeeman effect has been measured for the 21 cm line in emission in a number of morphologically prominent H I shells. The H I structures are in fact filamentary instead of sheetlike. B(parallel) is typically about 6.4 micro-G. If estimates of n(H I) are correct, magnetic pressure dominates thermal gas pressure by a factor of about 67, and linewidths are somewhat smaller than the Alfven velocity. B(parallel) as derived from the Zeeman effect does not correlate with Faraday rotation. A similar lack of correlation is found when comparing optical and diffuse synchrotron polarization in the North Polar Spur. Thus, the magnetic field is oriented differently in different types of region, with little if any correlation.
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