Laboratory measurements and astronomical search for the HSO radical Gabriele Cazzoli, Valerio Lattanzi, Till Kirsch, Jürgen Gauss, Belén Tercero, José Cernicharo and Cristina Puzzarini A&A, 591 (2016) A126 Published online: 24 June 2016 DOI: 10.1051/0004-6361/201628745