Isotope ratios in interstellar formaldehyde from 6 centimeter observations
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1982
- DOI:
- 10.1086/159763
- Bibcode:
- 1982ApJ...254..538K
- Keywords:
-
- Abundance;
- Centimeter Waves;
- Formaldehyde;
- Interstellar Gas;
- Isotope Effect;
- Molecular Clouds;
- Carbon 13;
- Nebulae;
- Oxygen 18;
- Astrophysics