Source-subtracted low-resolution images. The image weights are tapered to a resolution of 25″. Red contours indicate sources that were subtracted from the data, and cyan contours are smoothed Chandra X-ray contours in the energy band 0.5−7 keV (de Gasperin et al. 2015), linearly spaced between 10−100σ, where 1σ = 6.6 × 10⁻⁶ photons s⁻¹ cm⁻² arcmin⁻². The purple rectangle labeled P marks the brightest part of the visible halo. (a) 54 MHz, (b) 144 MHZ, (c) 325 MHZ.