2003ApJ...593L..97V


Query : 2003ApJ...593L..97V

2003ApJ...593L..97V - Astrophys. J., 593, L97-L100 (2003/August-3)

First detection of doubly deuterated hydrogen sulfide.

VASTEL C., PHILLIPS T.G., CECCARELLI C. and PEARSON J.

Abstract (from CDS):

This work was carried out using the Caltech Submillimeter Observatory and presents the observational study of HDS and D2S toward a sample of Class 0 sources and dense cores. We report the first detection of doubly deuterated hydrogen sulfide (D2S) in two dense cores and analyze the chemistry of these molecules, aiming to help understand the deuteration processes in the interstellar medium. The observed values of the D2S/HDS ratio and upper limits require an atomic D/H ratio in the accreting gas of 0.1-1. The study presented in this Letter supports the hypothesis that formaldehyde, methanol, and hydrogen sulfide are formed on the grain surfaces, during the cold prestellar 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 a recent gas-phase chemical model that includes H+3and its deuterated isotopomers, H2D+, D2H+, and D+3(Roberts, Herbst, & Millar).

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Clouds - ISM: Molecules - Molecular Data - Molecular Processes - Radio Lines: ISM

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRAS 03258+3104 Y*O 03 28 55.30 +31 14 27.8           ~ 160 1
2 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 421 3
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 639 1
4 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
5 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1280 1
6 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
7 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 284 0
8 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1450 0
9 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 739 0
10 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
11 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 710 1
12 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1113 1
13 LDN 1689N DNe 16 32 25.96 -24 28 46.2           ~ 111 0

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2021.09.23-23:04:45

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