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We have examined the giant radio galaxy 3C~236 using LOFAR at 143 MHz down toan angular resolution of 7", in combination with observations at higherfrequencies. We have used the low frequency data to derive spectral index mapswith the highest resolution yet at these low frequencies. We confirm a previousdetection of an inner hotspot in the north-west lobe and for the first timeobserve that the south-east lobe hotspot is in fact a triple hotspot, which maypoint to an intermittent source activity. Also, the spectral index map of 3C236 shows that the spectral steepening at the inner region of the northern lobeis prominent at low frequencies. The outer regions of both lobes show spectralflattening, in contrast with previous high frequency studies. We derivespectral age estimates for the lobes, as well as particle densities of the IGMat various locations. We propose that the morphological differences between thelobes are driven by variations in the ambient medium density as well as thesource activity history.

LOFAR first look at the giant radio galaxy 3C 236