Isotope ratios in interstellar formaldehyde from 6 centimeter observations

Details Isotope ratios in interstellar formaldehyde from 6 centimeter observations Isotope ratios in interstellar formaldehyde from 6 centimeter observations

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..538k&link_type=abstract

Astrophysical Journal, Part 1, vol. 254, Mar. 15, 1982, p. 538-542. Research supported by the Research Corp. and Fordham Univer

Astronomy and Astrophysics

Astrophysics

3

Abundance, Centimeter Waves, Formaldehyde, Interstellar Gas, Isotope Effect, Molecular Clouds, Carbon 13, Nebulae, Oxygen 18

Scientific paper

Observations of 6 cm absorption by H2CO-13 and H2CO-18 in Sgr A, Sgr B2, W51, W33, and Ori B are reported. These provide more accurate isotope ratios than have been previously reported, because both isotopes have been observed in the same manner, and the continuum sources were monitored on a regular basis. A double ratio, H2CO-13/H2C-18, is found close to the terrestrial value of 5.6 in the galactic plane sources, and enhanced to 7.6 in the galactic center sources.

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