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Fig. 7


Radio to hard X-ray spectral energy distribution (SED) of IRAS F00183–7111 (in red). The radio data, submillimetre to infrared data, and the optical to UV data are taken from Norris et al. (2012, references therein), Spoon et al. (2009) and NED, respectively. For comparison, the SEDs of Arp 220 and Mrk 231, normalised to the far-infrared peak of IRAS F00183-7111, are overplotted in light grey and blue, respectively. This gives a convenient way to see the spectral differences between the three SEDs. The Spitzer IRS low-resolution spectra of the three sources are also included. Strong radio and X-ray excess emission from the active nucleus and the mid-IR emission from hot dust are evident in IRAS F00183–7111 and Mrk 231, relative to Arp 220. Note that Mrk 231 is becoming more radio-loud in recent years than those the data plotted (Reynolds 2017).

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