Observational evidence to support a dense ambient medium shaping the jet in 3C 84 Jongho Park, Motoki Kino, Hiroshi Nagai, Masanori Nakamura, Keiichi Asada, Minchul Kam and Jeffrey A. Hodgson A&A, 685 (2024) A115 Published online: 14 May 2024 DOI: 10.1051/0004-6361/202347562