Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.9705h&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #97.05; Bulletin of the American Astronomical Society, Vol. 29, p.1366
Astronomy and Astrophysics
Astronomy
Scientific paper
We have measured the [(12) CO]/[(13) CO] abundance ratio in the Circumnuclear Disk, 1.5 pc from the center of the Galaxy. Observations of the CO J=6-5 short-submillimeter main and rarer isotopic lines are particularly clean probes of the isotope ratio in this molecular gas closest to the nucleus, gas deep within the central stellar cluster. Combined with millimeter and far-infrared CO line intensities, the new data constrain the [(12) CO]/[(13) CO] abundance ratio to be 24 +/- 2. Photodissociation and clumping make this a strict upper limit to the atomic [(12) C]/[(13) C] ratio. The ratio provides direct information on the connections between the molecular clouds within the Galaxy's innermost 200 pc and has implications for CO intensity to mass conversions in external galaxies.
Genzel Reinhard
Harris Andrew I.
Heyer Mark H.
Howe John Edward Jr.
Zmuidzinas Jonas
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