On the nature of the molecular cores in high-latitude cirrus clouds. II - Structure, stability, and physical conditions from CO-18) observations

Details On the nature of the molecular cores in high-latitude cirrus clouds. II - Structure, stability, and physical conditions from CO-18) observations On the nature of the molecular cores in high-latitude cirrus clouds. II - Structure, stability, and physical conditions from CO-18) observations

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..158t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 158-187.

Astronomy and Astrophysics

Astronomy

50

Carbon Isotopes, Carbon Monoxide, Infrared Cirrus (Astronomy), Molecular Clouds, Abundance, Astronomical Models, Interstellar Matter, Radiative Transfer

Scientific paper

Extensive observations of the J = 2 - 1 and 1 - 0 lines of C(O-18), (C-13)O, and (C-12)O have been made of 33 high-latitude cirrus cloud cores and two high-latitude, cold, dense molecular clouds. It is argued that C(O-18) is an essential observational tool for the understanding of molecular cloud structure. The formalism of molecular clouds has been developed both in polytropic hydrostatic equilibrium and also undergoing self-similar collapse has been developed, and these are applied to the C(O-18) observations. Six of the 15 objects with suitable C(O-18) observations are found to be consistent with hydrostatic equilibrium models. These and an additional four objects may be explained by the dynamical collapse models, and the remaining three objects cannot be explained by either type of model.

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