First Detection of Doubly Deuterated Hydrogen Sulfide | Zendy

C. Vastel | Zendy; T. G. Phillips | Zendy; C. Ceccarelli | Zendy; John C. Pearson | Zendy

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First Detection of Doubly Deuterated Hydrogen Sulfide

Author(s) -

C. Vastel,

T. G. Phillips,

C. Ceccarelli,

John C. Pearson

Publication year - 2003

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 - 10.1086/378261

Subject(s) - deuterium , isotopomers , hydrogen , hydrogen sulfide , chemistry , formaldehyde , gas phase , molecule , methanol , interstellar medium , astrochemistry , sulfide , physics , astrophysics , atomic physics , organic chemistry , sulfur , galaxy

This work was carried out with using the Caltech Submillimeter Observatoryand presents the observational study of HDS and D2S towards a sample of Class 0sources, and dense cores. We report the first detection of doubly deuteratedhydrogen sulfide (D2S) in two dense cores and analyze the chemistry of thesemolecules aiming to help understand the deuteration processes in theinterstellar medium. The observed values of the D2S/HDS ratio, and upperlimits, require an atomic D/H ratio in the accreting gas of 0.1-1. The studypresented in this Letter supports the hypothesis that formaldehyde, methanoland hydrogen sulfide are formed on the grain surfaces, during the coldpre-stellar core phase, where the CO depleted gas has large atomic D/H ratios.The high values for the D/H ratios are consistent with the predictions of arecent gas-phase chemical model that includes H3+ and its deuteratedisotopomers, H2D+, D2H+ and D3+ (Roberts et al. 2003).Comment: 14 pages, 2 figures. accepted in ApJ

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