Upper panel: rest-frame FIR (42.5–122.5 μm) vs. radio 1.4 GHz luminosity for GH500.30 (red star, assuming at z = 4.19 and z = 3.1, respectively). Radio-excess sources from Del Moro et al. (2013) are plotted as filled circles for comparison. The solid line corresponds to q = 2.21 (average for “radio-normal” sources) and the dotted line correspond to q = 1.68, for the selection limit for radio-excess sources. Lower panel: radio slope based on the observations at 1.4 GHz and 5.5 GHz. The 1.6 GHz flux obtained from the high-resolution VLBI observation is shown for comparison. The light-red shaded region shows the 1.4 GHz radio flux expected from the star-formation process, which is derived by extrapolating the best-fitting SED model to 1.4 GHz (Fig. 4).
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