Discovery of the interstellar cyanoacetylene radical cation HC3N+ C. Cabezas, M. Agúndez, Y. Endo, B. Tercero, N. Marcelino, P. de Vicente and J. Cernicharo A&A, 687 (2024) L22 Published online: 30 July 2024 DOI: 10.1051/0004-6361/202451081