===== On HC<sub>n</sub>S (n ≥ 2) Radicals in the ISM =====

J. Cernicharo, C. Cabezas, M. Agúndez, B. Tercero, J. R. Pardo, N. Marcelino, J. D. Gallego, F. Tercero, J. A. López-Pérez, and P. de Vicente\\
reported on\\
**[[https://doi.org/10.1051/0004-6361/202140642|TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H<sub>2</sub>CCS, H<sub>2</sub>CCCS, and C<sub>4</sub>S and detection of C<sub>5</sub>S]]**\\
//Astron. Astrophys.// **648**, Art. No. L3 (2021).\\
The ethynylsulfanyl radical, HCCS, was identified through 2 <sup>1</sup>H hyperfine components of the <sup>2</sup>Π<sub>3/2</sub> //J// = 7/2 − 5/2 transition near 41.1 GHz in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. The column density is slightly lower than that of H<sub>2</sub>CCS and about a factor of ten lower than that of HCS.\\
\\

R. Fuentetaja, M. Agúndez, C. Cabezas, B. Tercero, N. Marcelino, J. R. Pardo, P. de Vicente, and J. Cernicharo\\
reported on\\
**[[https://doi.org/10.1051/0004-6361/202245018|Discovery of Two New Interstellar Molecules with QUIJOTE: HCCCHCCC and HCCCCS]]**\\
//Astron. Astrophys.// **667**, Art. No. L4 (2022).\\
Butatrienethionyl was detected through six consecutive transitions with 19/2 ≤ //J"// ≤ 29/2 between 31.0 and 50.3 GHz in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. The column densities of HCS and HCCS are about factors of 58 and 7.2, respectively, higher than those of HC<sub>4</sub>S.\\
\\

 J. Cernicharo, C. Cabezas, M. Agúndez, R. Fuentetaja, B. Tercero, N. Marcelino, and P. de Vicente\\
announced\\
**[[https://doi.org/10.1051/0004-6361/202451256|More sulphur in TMC-1: Discovery of the NC<sub>3</sub>S and HC<sub>3</sub>S radicals with the QUIJOTE line survey]]**\\
//Astron. Astrophys.// **688**, Art. No. L13 (2024).\\
Propadienethionyl, HC<sub>3</sub>S, was detected through three consecutive transitions with 13/2 ≤ //J'// ≤ 17/2 between 34.8 and 45.6 GHz in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. The lines displayed well-resolved Λ-doubling and (reasonably) resolved <sup>1</sup>H hyperfine structure splitting. Some HFS compoents are (essentially) unblended, several slightly or severely. The authors state abundance ratios HCS/HCCS of ~8.1, HCCS/HC<sub>3</sub>S of ~4.5, and HC<sub>3</sub>S/HC<sub>4</sub>S of ~1.6. HC<sub>5</sub>S was evaluated to be near the present sensitivity limit of the survey.\\
\\

----

Contributor(s): H. S. P. Müller; 04, 2021; 11, 2022; 08, 2024

----