Fig. A.1

VLA 3 GHz contour maps of our 3 GHz detected SMGs. Each image is centred on the ALMA 1.3 mm peak position, is 5″ × 5″ in size, and displayed with north up and east left. The contour levels start from 3σ, and progress in steps of 2σ except for AzTEC/C61 where the level step is 15σ. The dashed contours show the negative features at the −3σ level. The blue plus signs and red crosses mark, respectively, the positions of the optical-NIR and X-ray sources seen towards those 3 GHz sources that are discussed in Appendix B and Sect. 2.1. The black filled circle in the first panel (AzTEC/C1a) shows the synthesised beam size of (FWHM). The projected angular offset between the ALMA source position (i.e. the image centre position) and the 3 GHz peak position is given in Col. (11) in Table C.1.
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