EWOCS-VIII: Internal kinematics and expansion of Westerlund 1 from VVVX proper motions

C. Ordenes-Huanca, A. Bayo, M. Guarcello +12

Westerlund 1 (Wd1) is the most massive young star cluster known in the Milky Way and a key laboratory for studying the early dynamical evolution of massive clusters. Owing to its h…