Warm neutral halos around molecular clouds. III - Interpretation of H I and CO J = 1-0 data

Details Warm neutral halos around molecular clouds. III - Interpretation of H I and CO J = 1-0 data Warm neutral halos around molecular clouds. III - Interpretation of H I and CO J = 1-0 data

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..464a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 464-473. Research supported by California Institute

Astronomy and Astrophysics

Astronomy

36

Halos, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Carbon Monoxide, Hydrogen Clouds, Limb Brightening

Scientific paper

The physical characteristics of the transition region separating the molecular and the atomic medium in interstellar clouds are studied using H I 21-cm and CO J = 1-0 data. Strong evidence is found for general heating of the surface layers of molecular clouds and for the existence of large heated neutral atomic halos around the molecular clouds. The heating of the molecular cloud surface is manifested through the general existence of limb brightening in the CO emission, with a characteristic depth of 1.7 pc, dependent on the Galactic latitude. The heated H I halos have a characteristic depth of 4.7 pc and a maximal extent of about 10 pc.

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