On the determination of magnetic fields in dense cloud complexes by the observation of Zeeman splitting

Astronomy and Astrophysics – Astrophysics

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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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