Warm H I halos around molecular clouds

Details Warm H I halos around molecular clouds Warm H I halos around molecular clouds

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..727w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 727-738.

Astronomy and Astrophysics

Astronomy

56

Carbon Monoxide, Hydrogen Clouds, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Astronomical Maps, Emission Spectra, Line Spectra, Ultraviolet Radiation

Scientific paper

Observations of H I have been made with the 305 m Arecibo dish toward the isolated edges of several molecular clouds. Comparison with 1.3 and 2.6 mm CO line emission indicates the existence of H I halos extending 0.5 to several pc beyond the CO boundaries. Because the halos appear in emission against the 100 K galactic H I background, the gas is evidently warmer than much of the interstellar H I gas. The observed column densities and transition zone thicknesses agree well with steady state calculations equating the formation rate of H2 on grains to its destruction by UV radiation.

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