The values of S_{1.4 GHz} were taken from the COSMOS VLA Deep Catalogue May 2010 (Schinnerer et al. 2010) except for AzTEC1, 8, and 11. AzTEC1 exhibits 4σ 1.4 GHz emission, hence is not listed in the VLA catalogue, which is comprised of ≥5σ sources. The value of S_{1.4 GHz} for AzTEC1 was taken as the peak surface brightness multiplied by 1.15 to correct for BWS (Younger et al. 2007). The resulting flux density of 48 ± 12 μJy agrees with the value reported by Younger et al. (2007, Table 2 therein). For AzTEC8 and 11 we adopted the 1.4 GHz flux densities from Younger et al. (2009, Table 2 therein), and multiplied them by 1.15 to correct for BWS as noted by the authors. The COSMOS VLA catalogue values of S_{1.4 GHz} for AzTEC8-W and AzTEC8-E are 237 ± 52 μJy and 186 μJy (no error given), respectively. However, AzTEC8-E is a stronger 1.4 GHz source than AzTEC8-W (Younger et al. 2009). For AzTEC11 the COSMOS VLA catalogue gives an integrated flux density value of S_{1.4 GHz} = 302 ± 45 μJy. Hence, we adopted the S_{1.4 GHz} values for AzTEC11-N and 11-S from Younger et al. (2009). The 3σ upper limits are reported for the non-detections, where 1σ ≃ 10–14.7 μJy beam^-1.

The value of T_B refers to the Rayleigh-Jeans brightness temperature at ν_obs = 3 GHz.

Radio spectral index between the observed-frame frequencies of 1.4 GHz and 3 GHz.