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The high surface-brightness sensitivity of the GLEAM survey image of thegiant radio galaxy GRG 0503-28 at 70-230 MHz has revealed aninversion-symmetric bending of its two lobes, while maintaining between theirbent portions a ~200 kpc wide strip-like radio emission gap. This lends thesource the appearance of a mega-sized X-shaped radio galaxy. Identifying theemission gap with the presence of a gaseous layer, probably a WHIM-filled sheetin the cosmic web, we suggest that the layer is the most likely cause of theinversion-symmetric bending of the two radio lobes. Multiple observationalmanifestations of such gaseous layers are noted. The two lobes of this GRG,known to extend very asymmetrically from the host galaxy, are remarkablysymmetric about the emission gap, confirming a curious trend noted earlier fordouble radio sources of normal dimensions. The anomalous radio spectralgradient reported for the northern lobe of this GRG is not substantiated.

Discovery of X-shaped Morphology of the Giant Radio Galaxy GRG 0503-286