Abstract
view Abstract Citations (100) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetic Fields, Pressures, and Thermally Unstable Gas in Prominent H i Shells Heiles, Carl Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1989 DOI: 10.1086/167051 Bibcode: 1989ApJ...336..808H Keywords: H I Regions; Interstellar Gas; Interstellar Magnetic Fields; Emission Spectra; Faraday Effect; Gas Pressure; Signal To Noise Ratios; Thermal Stability; Zeeman Effect; Astrophysics; INTERSTELLAR: MAGNETIC FIELDS; RADIO SOURCES: 21 CM RADIATION; ZEEMAN EFFECT full text sources ADS | data products SIMBAD (6)
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