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We report multi-epoch Very Long Baseline Interferometric (VLBI) observationsof the compact radio lobe in the radio galaxy 3C84 (NGC1275) during 2016 -2020. The image sequence of 3C84 reveals that the hotspot in the radio lobeshowed the one-year long frustration in 2017 within a compact region of about0.07 parsec, suggesting a strong collision between the jet and a compact densecloud with the estimated average density about $(4\-- 6)\times 10^{5}~{\rmcm^{-3}}$. Although the hotspot and the radio lobe began to move south againafter its breakout, the radio lobe showed a morphological transition from FRII- to FR I-class radio lobe and its radio flux became fainter. This is thefirst detection of the dynamical feedback from the cloud to the jet where thecloud located on the jet axis significantly interferes with the jet propagationand evolution at the central one-parsec region in active galactic nucleus.

Morphological transition of the compact radio lobe in 3C84 via the strong jet-cloud collision