Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..195g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 195-198.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Chemical Evolution, Formaldehyde, Galactic Nuclei, Milky Way Galaxy, Molecular Clouds, Carbon Isotopes, Interstellar Chemistry, Line Spectra, Spectrum Analysis
Scientific paper
Measurements of the 110-111 and 211-212 lines of H2CO and the 110-111 line of H213CO toward ≡20 galactic center clouds (projected galactocentric radius ≤1 kpc) are presented. With an LVG treatment of the radiative transfer, H2 densities and trapping corrected [12C]/[13C] ratios (20 - 25) are derived, consistent with those determined toward the molecular cloud complexes Sgr B2 and Sgr A. The gas of the galactic center region appears to be chemically homogeneous. A general [12C]/[13C] anomaly in the expanding molecular ring is not confirmed. The [13C16O]/[12C18O] double isotope ratio derived from M -0.13-0.08, 8.6±1.2, agrees with that toward Sgr B2 and suggests [16O]/[18O] ratios ≡200. Implications for the chemical evolution in the galactic center region are discussed.
Batrla Wolfgang
Guesten Rolf
Henkel Carsten
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