Detection of D 2 H + in the Dense Interstellar Medium | Zendy

C. Vastel | Zendy; T. G. Phillips | Zendy; Hiroshige Yoshida | Zendy

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Detection of D ₂ H ⁺ in the Dense Interstellar Medium

Author(s) -

C. Vastel,

T. G. Phillips,

Hiroshige Yoshida

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/421265

Subject(s) - physics , protostar , deuterium , interstellar medium , astrophysics , line (geometry) , ground state , cosmochemistry , atomic physics , star formation , stars , geometry , mathematics , galaxy

The 692 GHz para ground-state line of D2H+ has been detected at the CaltechSubmillimeter Observatory towards the pre-stellar core 16293E. The derived D2H+abundance is comparable to that of H2D+, as determined by observations of the372 GHz line of ortho-H2D+. This is an observational verification of recenttheoretical predictions (Roberts, Herbst & Millar 2003), developed to explainthe large deuteration ratios observed in cold, high-density regions of theinterstellar 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 themodels leads to predictions of higher values of the D/H ratio in the gas phase.Comment: 13 pages; accepted in ApJ Letter

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