Title : Deuterated thioformaldehyde in the Barnard 1 cloud
Authors : N. Marcelino, J. Cernicharo, E. Roueff, M. Gerin, R. Mauersberger
Abstract :
We report on the detection of deuterated molecules in several dark clouds (Barnard 1, TMC-1, L154 using the
IRAM 30m telescope at Pico Veleta.
During a 3mm line survey on these sources, we found several transitions that intially were considered as
unidentified. Taking into account the reduced number of possible candidates, we discovered that these lines
were arising from D2CS constants of these molecules, in particular those of D2CS. The HDCS/H2CS and D2CS/HDCS abundance
ratios in Barnard 1 are both =0.3, implying an extremely high D-enhancement in thioformaldehyde towards this cloud.