Cygnus OB2 as a test case for particle acceleration in young massive star clusters S. Menchiari, G. Morlino, E. Amato, N. Bucciantini and M. T. Beltrán A&A, 686 (2024) A242 Published online: 18 June 2024 DOI: 10.1051/0004-6361/202348817