Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-22
Astrophys.J. 606 (2004) L127-L130
Astronomy and Astrophysics
Astrophysics
13 pages; accepted in ApJ Letters
Scientific paper
10.1086/421265
The 692 GHz para ground-state line of D2H+ has been detected at the Caltech Submillimeter Observatory towards the pre-stellar core 16293E. The derived D2H+ abundance is comparable to that of H2D+, as determined by observations of the 372 GHz line of ortho-H2D+. This is an observational verification of recent theoretical predictions (Roberts, Herbst & Millar 2003), developed to explain the large deuteration ratios observed in cold, high-density regions of the interstellar medium associated with low mass pre-stellar cores and protostars. This detection confirms expectations that the multiply deuterated forms of H3+ were missing factors of earlier models. The inclusion of D2H+ and D3+ in the models leads to predictions of higher values of the D/H ratio in the gas phase.
Phillips Thomas G.
Vastel Charlotte
Yoshida Hajime
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