Warm neutral halos around molecular clouds. II - H I and CO (J = 1-0) observations

Details Warm neutral halos around molecular clouds. II - H I and CO (J = 1-0) observations Warm neutral halos around molecular clouds. II - H I and CO (J = 1-0) observations

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75..987w&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, April 1991, p. 987-998. Research supported by NASA and Califo

Astronomy and Astrophysics

Astrophysics

24

Carbon Monoxide, Halos, Hydrogen, Interstellar Gas, Molecular Clouds, Emission Spectra, H Ii Regions, Interstellar Radiation, Radio Emission

Scientific paper

Observational data are presented relating to the boundary regions between dense, molecular clouds and the more diffuse atomic gas. The data set consists of H I 21 cm and CO (J = 1-0) strip maps in 14 molecular clouds which traverse 62 known CO cloud boundaries. The angular lengths of the strips range from 0.5 deg to several degrees of arc, which is generally adequate to eliminate confusion with background (and foreground) H I. Most of the crossed boundaries (49 of 62) show clear evidence for the presence of H I emission maxima, or halos, lying outside the molecular clouds' gas. There is also general evidence for limb brightening in the CO emission.

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