2022A&A...657L...4C


Query : 2022A&A...657L...4C

2022A&A...657L...4C - Astronomy and Astrophysics, volume 657, L4-4 (2022/1-1)

Discovery of the elusive thioketenylium, HCCS+, in TMC-1.

CABEZAS C., AGUNDEZ M., MARCELINO N., TERCERO B., ENDO Y., FUENTETAJA R., PARDO J.R., DE VICENTE P. and CERNICHARO J.

Abstract (from CDS):

We report the detection in TMC-1 of the cation HCCS+ (XX~3Σ), 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 40 m 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)x1012 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.

Abstract Copyright: © ESO 2022

Journal keyword(s): astrochemistry - ISM: molecules - ISM: individual objects: TMC-1 - line: identification - molecular data

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 192 0
2 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1567 0

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2023.01.27-19:49:24

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