Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.139g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Feb. 1, 1979, p. L139-L141.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Hydrogen Clouds, Interstellar Matter, Ion Emission, Molecular Ions, Abundance, Carbon Isotopes, Emission Spectra, Molecular Rotation, Oxygen Isotopes
Scientific paper
Line emission at 85.1 GHz attributed to the J equals 1-0 rotational transition of the formyl ion HC(O-18)(plus) has been detected in Sgr B2 (OH). The double isotopic ratio (O-16/O-18)/(C-12/C-13) in the formyl ion in Sgr B2 is estimated to be in the range 5-10, hence within a factor 2 of the terrestrial value of 5.5. This determination implies that the C-13/C-12 ratio near the galactic center does not differ greatly from that in local molecular clouds.
Guélin Michel
Thaddeus Patrick
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