Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC

Details Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC

1996-07-10

arxiv.org/abs/astro-ph/9607053v1

Astronomy and Astrophysics

Astrophysics

4 pages uuencoded gzip-compressed .tar file including one figures, To appear in A&A Letter, further comments: please contact Y

Scientific paper

The first definite discoveries of extragalactic deuterium are reported. DCO$^+$ has been detected in three and DCN has been measured in one star-forming region of the Large Magellanic Cloud (LMC). While the HCO$^+$/DCO$^+$ abundance ratios are found to be 19 $\pm$ 3, 24 $\pm$ 4, and 67 $\pm$ 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 $\pm$ 5 is obtained for N113. These results are consistent with a gas temperature of about 20\,K and a D/H ratio of about $1.5 \times 10^{-5}$, consistent with that observed in the Galaxy. If the cloud temperature is closer to 30\,K, then a D/H ratio is required to be up to an order of magnitude larger. Because this ratio provides a lower limit to the primordial D/H ratio, it indicates that the baryon mass density alone is unable to close the universe.

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