TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, HCCS, HCCCS, and CS and detection of CS.

Astron Astrophys

Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain.

Published: April 2021

We report the detection of the sulfur-bearing species NCS, HCCS, HCCS, HCCCS, and CS for the first time in space. These molecules were found towards TMC-1 through the observation of several lines for each species. We also report the detection of CS for the first time in a cold cloud through the observation of five lines in the 31-50 GHz range. The derived column densities are (NCS) = (7.8±0.6)×10 cm, (HCCS) = (6.8±0.6)×10 cm, N(HCCS) = (7.8±0.8)×10 cm, N(HCCCS) = (3.7±0.4)×10 cm, N(CS) = (3.8±0.4)×10 cm, and N(CS) = (5.0±1.0)×10 cm. The observed abundance ratio between CS and CS is 340, that is to say a factor of approximately one hundred larger than the corresponding value for CCS and CS. The observational results are compared with a state-of-the-art chemical model, which is only partially successful in reproducing the observed abundances. These detections underline the need to improve chemical networks dealing with S-bearing species.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7610586PMC
http://dx.doi.org/10.1051/0004-6361/202140642DOI Listing

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