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        LOFAR first look at the giant radio galaxy 3C 236

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        Author
        Shulevski, A.
        Barthel, P. D.
        Morganti, R.
        Harwood, J. J.
        Brienza, M.
        Shimwell, T. W.
        Röttgering, H. J. A.
        White, G. J.
        Callingham, J. R.
        Mooney, S.
        Rafferty, D. A.
        Attention
        2299/21521
        Abstract
        We have examined the giant radio galaxy 3C~236 using LOFAR at 143 MHz down to an angular resolution of 7", in combination with observations at higher frequencies. We have used the low frequency data to derive spectral index maps with the highest resolution yet at these low frequencies. We confirm a previous detection of an inner hotspot in the north-west lobe and for the first time observe that the south-east lobe hotspot is in fact a triple hotspot, which may point to an intermittent source activity. Also, the spectral index map of 3C 236 shows that the spectral steepening at the inner region of the northern lobe is prominent at low frequencies. The outer regions of both lobes show spectral flattening, in contrast with previous high frequency studies. We derive spectral age estimates for the lobes, as well as particle densities of the IGM at various locations. We propose that the morphological differences between the lobes are driven by variations in the ambient medium density as well as the source activity history.
        Publication date
        2019-07-28
        Published in
        Astronomy & Astrophysics
        Published version
        https://doi.org/10.1051/0004-6361/201935586
        License
        Other
        Other links
        http://hdl.handle.net/2299/21521
        Relations
        School of Humanities
        School of Creative Arts
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