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Detection of D2H+ in the Dense Interstellar Medium | | C.Vastel
; T.G. Phillips
; H. Yoshida
; | | Date: |
22 Mar 2004 | | Journal: | Astrophys.J. 606 (2004) L127-L130 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0403537 | | Services: | Forum | Review | PDF | Favorites | |
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