Analysis and interpretation of H I self-absorption lines. I

Details Analysis and interpretation of H I self-absorption lines. I Analysis and interpretation of H I self-absorption lines. I

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..416l&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 416-423.

Astronomy and Astrophysics

Astronomy

27

H Lines, Hydrogen Atoms, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Self Absorption, Absorption Spectra, Carbon Monoxide, Centimeter Waves, Cold Gas, Neutral Atoms, Spin Temperature, Temperature Distribution, Velocity Distribution

Scientific paper

Several factors which limit selection of reliable information from observations of H I 21-cm self-absorption lines are examined. It is noted that (1) strong correlation of the spin temperature T(s) and optical depth tau make them separately indeterminate, (2) the observational noise and/or spatial fluctuations in the H I emission background strongly limit the precision to which the T(s), tau combination can be specified, and (3) gradients in the background H I emission result in systematic shifts of the observed velocity. Empirical formulas are presented for correcting the H I self-absorption features for the velocity effects; the practical evidence of various limiting factors is illustrated by observations of H I self-absorption lines and CO emission lines in nearby clouds.

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