Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l..85e&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L85-L88.
Astronomy and Astrophysics
Astrophysics
12
Circular Polarization, Hydrogen Clouds, Interstellar Magnetic Fields, Interstellar Matter, Zeeman Effect, Amplitude Distribution Analysis, Hydrogen Atoms, Neutral Particles
Scientific paper
The relative amplitude, S, of the right-circular-polarization (RCP) minus left-circular-polarization (LCP) Zeeman pattern for radiation from a self-gravitating cloud is shown to be insensitive to the internal magnetic-field strength if that cloud is supported by the field. For H I at 21 cm, S is approximately 0.0004 times the square root of the cloud H2 density. Thus giant cloud complexes and small individual clouds alike may give the same S if their densities are about the same. Two giant cloud complexes are described where Zeeman experiments with detectable H I might be useful. Three small dust clouds which contain promising 21-cm absorption lines are also cited.
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