2005ApJ...620..308M


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET10:49:01

2005ApJ...620..308M - Astrophys. J., 620, 308-320 (2005/February-2)

Deuterated thioformaldehyde in the Barnard 1 cloud.

MARCELINO N., CERNICHARO J., ROUEFF E., GERIN M. and MAUERSBERGER R.

Abstract (from CDS):

We present observations of the singly and doubly deuterated species of thioformaldehyde, HDCS and D2CS, toward the dark cloud Barnard 1. This is the first detection of D2CS in space and in dense, cold prestellar regions. Column densities obtained using rotational diagrams and a large velocity gradient model show an extremely high D enhancement in thioformaldehyde in Barnard 1. Although the column density of H2CS is smaller than that of H2CO, both species show similar D enhancements in their singly and doubly deuterated species. A chemical model–including multiply deuterated species–has been used in order to interpret the observations. Predicted rotational frequencies from laboratory data for HDCS and D2CS are significantly in error when compared to the observed frequencies in space. Consequently, we have derived new rotational constants for these two species and for H2CS and H2C34S using the observed frequencies in Barnard 1. The new rotational constants allow us to predict the rotational transitions of these species with the accuracy needed for the narrow line emerging from dark clouds. Rotational constants for HDCS and D2CS have been obtained from the observed transitions in the laboratory and in space.

Abstract Copyright:

Journal keyword(s): Astrochemistry - ISM: Abundances - ISM: Individual: Name: Barnard 1 - ISM: Molecules

Simbad objects: 11

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Number of rows : 11

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 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 269 0
2 2MASS J03331667+3107548 Y*O 03 33 16.68 +31 07 54.9           ~ 103 2
3 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 167 0
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1104 0
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1392 0
6 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 710 0
7 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
8 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 587 1
9 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 696 1
10 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1073 1
11 NAME IRAS 16293E cor 16 32 29.060 -24 29 10.27           ~ 54 1

    Equat.    Gal    SGal    Ecl

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