Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..540p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 540-550.
Astronomy and Astrophysics
Astronomy
77
Hydrogen Clouds, Interstellar Matter, Radio Sources (Astronomy), Spin Temperature, Absorption Spectra, Centimeter Waves, Temperature Measurement
Scientific paper
Arecibo 3-arcsec beam neutral hydrogen emission-absorption observations are analyzed, and spin temperature results in the direction of 'small' and 'large' extragalactic sources are found to be statistically similar. The variations in derived spin temperature from case to case are threrefore real. The mean emission temperature as a function of velocity is determined for widely dispersed warm material which is independent of a cloud and not strongly absorbing. Correcting the emission-absorption data for the contribution of this material's emission yields harmonic mean cloud spin temperatures which vary approximately as the -1/3 power of the cloud optical depth. It is not yet known whether a measured cloud spin temperature represents a single gas temperature or a composite, as in the type of model proposed by McKee and Ostriker (1977).
Payne Harry E.
Salpeter Edwin E.
Terzian Ye.
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