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Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC | | Y.-N. Chin
; C. Henkel
; T.J. Millar
; J.B. Whiteoak
; R. Mauersberger
; | | Date: |
11 Jul 1996 | | Subject: | astro-ph | | Abstract: | 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 $1.5 imes 10^{-5}$, 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. | | Source: | arXiv, astro-ph/9607053 | | Services: | Forum | Review | PDF | Favorites | |
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