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TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S

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arxiv 2103.12431 v1 pith:G4KXM4WX submitted 2021-03-23 astro-ph.GA

TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S

J. Cernicharo , C. Cabezas , M. Agundez , B. Tercero , J. R. Pardo , N. Marcelino , J. D. Gallego , F. Tercero
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J. A. Lopez-Perez P. de Vicente
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keywords cm-2detectionh2cccsh2ccshccsspecieschemicalfirst
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We report the detection of the sulfur-bearing species NCS, HCCS, H2CCS, H2CCCS, and C4S 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 C5S 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 N(NCS) = (7.8 +/- 0.6)e11 cm-2, N(HCCS) = (6.8 +/- 0.6)e11 cm-2, N(H2CCS) = (7.8 +/- 0.8)e11 cm-2, N(H2CCCS) = (3.7 +/- 0.4)e11 cm-2, N(C4S) = (3.8 +/- 0.4)e10 cm-2, and N(C5S) = (5.0 +/- 1.0)e10 cm-2. The observed abundance ratio between C3S and C4S is 340, that is to say a factor of approximately one hundred larger than the corresponding value for CCS and C3S. 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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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Laboratory spectroscopy, theoretical characterization, and astronomical search for syn-propenethial (CH2CHCHS)

    astro-ph.GA 2026-07 accept novelty 6.0

    syn-propenethial is undetected in TMC-1 (N < 1.5e10 cm^-2) because gas-phase formation yields ~95% anti and tunneling isomerizes the rest on ~10^3 yr timescales.

  2. Chemistry of Dark Molecular Clouds

    astro-ph.GA 2026-07 unverdicted novelty 2.0

    A comprehensive review arguing that the chemically rich cores TMC-1 CP and L1544 are representative molecular-cloud laboratories, and that complex organic molecule production is largely insensitive to metallicity.