C-12/C-13 isotope ratio across the Galaxy from observations of C-13/O-18 in molecular clouds

Details C-12/C-13 isotope ratio across the Galaxy from observations of C-13/O-18 in molecular clouds C-12/C-13 isotope ratio across the Galaxy from observations of C-13/O-18 in molecular clouds

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..477l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 477-492.

Astronomy and Astrophysics

Astrophysics

230

Carbon Monoxide, Carbon 13, Interstellar Gas, Milky Way Galaxy, Molecular Clouds, Oxygen 18, Chemical Evolution, Nuclear Astrophysics, Star Formation Rate, Stellar Evolution

Scientific paper

The carbon isotopic ratio across the Galaxy was studied by observing nine interstellar clouds in the doubly rare isotope of carbon monoxide, C-13/O-18, and in the rare isotopic species C-12/O-18. The goal in this study was to improve the data from optically thin carbon monoxide emissions. A systematic gradient is found in the C-12/C-13 isotopic ratio across the Galaxy, ranging from about 30 in the inner part at 5 kpc to about 70 at 12 kpc, with a Galactic center value of 24. Near the solar radius the average ratio is 57, but it is somewhat larger, about 67, in Orion. Carbon monoxide isotopic ratios are smaller than those of formaldehyde, but they have roughly the same slope across the Galaxy. The result of 57 for the local CO ratio lies between the values from various CH(+) absorption measurements.

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