Isotopic Ratios from 6.8 Centimeter Observations of H2C(18) O
Abstract
The 6.8-cm transition of H2C(O-18) has been observed in absorption in the direction of Sgr A, Sgr B2, and W33. The average molecular isotopic abundance ratio, H2(C-13)O/H2C(O-18), for the three sources is 6.9 with no evidence for source-to-source variation. If the oxygen isotopes have the terrestrial abundance and if fractionation in the formation of the formaldehyde isotopic species is not significant, the derived C-12/C-13 carbon isotope ratio would be 72.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1979
- DOI:
- 10.1086/182886
- Bibcode:
- 1979ApJ...227L.143T
- Keywords:
-
- Carbon Isotopes;
- Formaldehyde;
- Interstellar Matter;
- Oxygen Isotopes;
- Radio Astronomy;
- Absorption Spectra;
- Abundance;
- Centimeter Waves;
- Fractionation;
- Astrophysics