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Discovery of the elusive thioketenylium, HCCS+, in TMC-1
- Source :
- A&A 657, L4 (2022)
- Publication Year :
- 2021
-
Abstract
- We report the detection in TMC-1 of the cation HCCS+ (3Sigma-), which is the protonated form of the widespread radical CCS. This is the first time that a protonated radical has been detected in a cold dark cloud. Twenty-six hyperfine components from twelve rotational transitions have been observed with the Yebes 40m and IRAM 30m radio telescopes. We confidently assign the characteristic rotational spectrum pattern to HCCS+ based on the good agreement between the astronomical and theoretical spectroscopic parameters. The column density of HCCS+ is (1.1+/-0.1)e12 cm-2, and the CCS/HCCS+ abundance ratio is 50+/-10, which is very similar to that of CS/HCS+ (35+/-8) and CCCS/HCCCS+ (65+/-20). From a state-of-the-art gas-phase chemical model, we conclude that HCCS+ is mostly formed by reactions of proton transfer from abundant cations such as HCO+, H3O+, and H3+ to the radical CCS.<br />Comment: Accepted for publication in A&A Letters on December 21st
- Subjects :
- Astrophysics - Astrophysics of Galaxies
Subjects
Details
- Database :
- arXiv
- Journal :
- A&A 657, L4 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2112.11855
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/202142815