Molecular abundances in the Magellanic Clouds .2. Deuterated species in the LMC

Y.N. Chin; C. Henkel; TJ Millar; J.B. Whiteoak; R. Mauersberger

Molecular abundances in the Magellanic Clouds .2. Deuterated species in the LMC

Y.N. Chin, C. Henkel, TJ Millar, J.B. Whiteoak, R. Mauersberger

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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 +/- 3, 24 +/- 4, and 67 +/- 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 +/- 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 x 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.

Original language	English
Pages (from-to)	L33-L36
Number of pages	4
Journal	Astronomy and Astrophysics
Volume	312
Publication status	Published - 1996

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@article{48851edfcabd490ab8267ecf6607a42b,

title = "Molecular abundances in the Magellanic Clouds .2. Deuterated species in the LMC",

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 +/- 3, 24 +/- 4, and 67 +/- 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 +/- 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 x 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.",

author = "Y.N. Chin and C. Henkel and TJ Millar and J.B. Whiteoak and R. Mauersberger",

year = "1996",

language = "English",

volume = "312",

pages = "L33--L36",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Molecular abundances in the Magellanic Clouds .2. Deuterated species in the LMC

AU - Chin, Y.N.

AU - Henkel, C.

AU - Millar, TJ

AU - Whiteoak, J.B.

AU - Mauersberger, R.

PY - 1996

Y1 - 1996

N2 - 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 +/- 3, 24 +/- 4, and 67 +/- 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 +/- 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 x 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.

AB - 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 +/- 3, 24 +/- 4, and 67 +/- 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 +/- 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 x 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.

M3 - Article

VL - 312

SP - L33-L36

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

ER -