Discovery of interstellar ketenyl (HCCO), a surprisingly abundant radical.Published in:Astronomy & Astrophysics / Astronomie et Astrophysique, 2015, v. 577, p. 1, doi. 10.1051/0004-6361/201526317By:Agúndez, Marcelino;Cernicharo, José;Guélin, MichelPublication type:Article