[12C]/[13C] ratios from formaldehyde in the inner galactic disk

Details [12C]/[13C] ratios from formaldehyde in the inner galactic disk [12C]/[13C] ratios from formaldehyde in the inner galactic disk

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..148h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 148-152.

Astronomy and Astrophysics

Astrophysics

27

Carbon 12, Carbon 13, Forbidden Bands, Formaldehyde, Galactic Nuclei, Milky Way Galaxy, Astronomical Models, Astronomical Spectroscopy, Galactic Evolution, Radiative Transfer, Ratios

Scientific paper

New formaldehyde measurements toward 6 sources in the inner galactic disk (5 kpc ≤ RGC ≤ 8 kpc) are reported. From measurements of the 110 - 111 line of H212C16O and H213C16O and of the 211 - 212 line of H212C16O, [H212C16O]/[H213C16O] ratios are derived. The average corrected ratio is ≡50 for the inner galactic disk. A decrease in the [12C]/[13C] ratio by a factor of ≡2 compared with the local interstellar medium is qualitatively consistent with predictions from galactic evolution models and the higher metallicity of the gas in the inner galactic disk.

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