| Issue |
A&A
Volume 682, February 2024
|
|
|---|---|---|
| Article Number | L4 | |
| Number of page(s) | 9 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202349105 | |
| Published online | 31 January 2024 | |
Letter to the Editor
Discovery of thiofulminic acid with the QUIJOTE line survey: A study of the isomers of HNCS and HNCO in TMC-1⋆
1
Dept. de Astrofísica Molecular, Instituto de Física Fundamental (IFF-CSIC), C/ Serrano 121, 28006 Madrid, Spain
e-mail: jose.cernicharo@csic.es
2
Observatorio Astronómico Nacional (OAN, IGN), C/ Alfonso XII, 3, 28014 Madrid, Spain
3
Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain
Received:
26
December
2023
Accepted:
9
January
2024
We present the first detection of HCNS (thiofulminic acid) in space with the QUIJOTE line survey in the direction of TMC-1. We performed a complete study of the isomers of CHNS and CHNO, including NCO and NCS. The derived column densities for HCNS, HNCS, and HSCN are (9.0 ± 0.5) × 109, (3.2 ± 0.1) × 1011, and (8.3 ± 0.4) × 1011 cm−2, respectively. The HNCS/HSCN abundance ratio is 0.38. The abundance ratios HNCO/HNCS, HCNO/HCNS, HOCN/HSCN, and NCO/NCS are 34 ± 4, 8.3 ± 0.7, 0.18 ± 0.03, and 0.78 ± 0.07, respectively. These ratios cannot be correctly reproduced by our gas-phase chemical models, which suggests that formation paths for these species are missing, and/or that the adopted dissociative recombination rates for their protonated precursors have to be revised. The isotopologues H15NCO, DNCO, HN13CO, DCNO, H34SCN, and DSCN have also been detected with the ultrasensitive QUIJOTE line survey.
Key words: astrochemistry / line: identification / molecular data / ISM: molecules / ISM: individual objects
Based on observations with the Yebes 40 m radio telescope (projects 19A003, 20A014, 20D023, 21A011, 21D005, 22A007, 22B029, and 23A024) and the IRAM 30m radiotelescope. The 40 m radiotelescope at Yebes Observatory is operated by the Spanish Geographic Institute (IGN, Ministerio de Transportes y Movilidad Sostenible). IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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