Observations of the carbon-13 isotope of formaldehyde

Details Observations of the carbon-13 isotope of formaldehyde Observations of the carbon-13 isotope of formaldehyde

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..303w&link_type=abstract

Astronomy and Astrophysics, vol. 51, no. 2, Sept. 1976, p. 303-311.

Astronomy and Astrophysics

Astrophysics

43

Abundance, Carbon 13, Fine Structure, Formaldehyde, Molecular Spectra, Absorption Spectra, Electron Transitions, Galactic Evolution, Interstellar Matter, Line Spectra

Scientific paper

Line profiles were obtained for the 1(11)-1(10) transitions of H2(C-12)O and H2(C-13)O (4.83 and 4.59 GHz, respectively) toward 11 galactic continuum sources containing molecular clouds. Hyperfine structure of H2(C-13)O in interstellar space was detected for the first time. The data were used to determine apparent (C-12/C-13) isotopic ratios. The sources studied are contained within one quadrant of the galactic plane, and the mean value for the (C-12/C-13) isotopic ratio is 46 with a standard deviation of 18. A spatial gradient of the isotopic ratio of less than 30% for galactocentric distances from 4 to 12 kpc is found, but because of possible systematic effects and uncertainties in the individual ratios, this spatial gradient may not be significant.

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