Formaldehyde 110-111 and 211-212 transitions in molecular clouds - gas densities and H2CO abundance.

Details Formaldehyde 110-111 and 211-212 transitions in molecular clouds - gas densities and H2CO abundance. Formaldehyde 110-111 and 211-212 transitions in molecular clouds - gas densities and H2CO abundance.

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990acaps..10..241x&link_type=abstract

Acta Astrophys. Sin., Vol. 10, No. 3, p. 241 - 247

Astronomy and Astrophysics

Astrophysics

Interstellar Molecules: Formaldehyde, Molecular Clouds: Radiative Transfer, Infrared Cirrus: Formaldehyde

Scientific paper

The radiative transfer on formaldehyde in molecular clouds is analyzed and calculated by using a large velocity gradient model. The results for gas temperatures 10K, 20K, 40K, and 70K are presented schematically. It is shown that the observations of H2CO 110-111 and 211-212 transitions at a similar resolution can be used to estimate the gas density and H2CO fractional abundance in molecular clouds. In the range 20K - 100K the results are not very sensitive to the gas temperature. Some physical parameters of the core of the cirrus cloud 7 are estimated.

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