N. Marcelino, C. Puzzarini, M. Agúndez, R. Fuentetaja, B. Tercero, P. de Vicente, and J. Cernicharo
described the
First Detection of the HSO Radical in Space
Astron. Astrophys. 674, Art. No. L13 (2023).
Several hyperfine components of the 1₀₁ − 0₀₀ transition near 39.5 and 39.9 GHz were detected with the Yebes 40 m dish toward the cold dense cores B1-b, TMC-1 CP, and L183 in the course of molecular line surveys. The strongest component near 39.532 GHz was also identified toward L483, L1495B, L1527, and Lupus-1A. The abundance ratio of SO to HSO shows some scatter, the former being often around a factor of 100 more abundant. There is indication that the ratio in L1527 is more like 6.

Contributor(s): H. S. P. Müller; 06, 2023