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Radio phoenices are complex and filamentary diffuse radio sources found inboth merging and relaxed clusters. The formation of these sources was proposedto be adiabatic compression of old Active Galactic Nucleus (AGN) plasma inshock waves. Most of the previous spectral studies of these sources werelimited to integrated spectral indices, which were found to be very steep aswell as show a curved spectrum. Here, we have performed a multi-frequencyinvestigation of the radio phoenix in the Abell 85 cluster. Owing to thesensitive high-resolution observations, we found some of the finer filamentarystructures that were previously undetected. We produced resolved spectral indexmaps of the radio phoenix between 148, 323, 700, and 1280 MHz. The orientationof the filaments, as well as the gradient across the spectral index mapssuggest the possible direction of the shock motion from northeast to southwest.The integrated spectral index of the radio phoenix was found to be very steepwith a break at around 700 MHz, indicating the re-energization of fossilelectrons being recent. Furthermore, the spectral index of the filaments wasfound to be less steep compared to the non-filamentary regions, implyinggreater energy injection in the filaments. The observed features in the radiophoenix in the Abell 85 cluster seem to be in support of the adiabatic shockcompression mechanism.

A Multi-Frequency View of the Radio Phoenix in the Abell 85 Cluster