Imaging spectroscopy of a spectral bump in a type II radio burst Peijin Zhang, Diana E. Morosan, Pietro Zucca, Sanna Normo, Bartosz Dabrowski, Andrzej Krankowski and Christian Vocks A&A, 684 (2024) L22 Published online: 24 April 2024 DOI: 10.1051/0004-6361/202449365