First detection of the HSO radical in space N. Marcelino, C. Puzzarini, M. Agúndez, R. Fuentetaja, B. Tercero, P. de Vicente and J. Cernicharo A&A, 674 (2023) L13 Published online: 20 June 2023 DOI: 10.1051/0004-6361/202346935