Formaldehyde observations of giant molecular clouds

Details Formaldehyde observations of giant molecular clouds Formaldehyde observations of giant molecular clouds

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..931w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 931-947.

Astronomy and Astrophysics

Astronomy

14

Abundance, Fine Structure, Formaldehyde, Interstellar Chemistry, Molecular Clouds, Absorption Spectra, H Ii Regions, Radiative Transfer, Radio Sources (Astronomy), Velocity Distribution

Scientific paper

The 110 <- 111 and 211 <- 212 K-doublet transitions of H2CO have been observed in absorption toward 26 strong continuum radio sources in the first Galactic quadrant. A total of 124 discrete absorption components have been detected in the 6 cm 110 <- 111 line. Of these, 69 have corresponding detections in the 2 cm 211 <- 212 transition. The data are analyzed with a elaborate radiative transfer model. The authors obtain median H2 densities of 9×104cm-3 for clouds near H II regions and 7×104cm-3 for clouds well removed from H II regions; the scatter in both populations is large, with densities falling in the range 104 - 106cm-3.

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