Dynamic massive star formation: Radio flux variability in UC H II regions A. Y. Yang, M. A. Thompson, J. S. Urquhart, A. Brunthaler, K. M. Menten, Y. Gong, Chao-Wei Tsai, A. L. Patel, D. Li and W. D. Cotton A&A, 694 (2025) A26 Published online: 30 January 2025 DOI: 10.1051/0004-6361/202452078