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We investigate the far‐infrared–radio correlation (FRC) of stellar‐mass‐selected galaxies in the Extended  Chandra  Deep Field‐South using far‐infrared (FIR) imaging from  Spitzer  and radio imaging from the Very Large Array and Giant Metre‐Wave Radio Telescope. We stack in redshift bins to probe galaxies below the noise and confusion limits. Radio fluxes are  K ‐corrected using observed flux ratios, leading to tentative evidence for an evolution in spectral index. We compare spectral energy distribution (SED) templates of local galaxies for  K ‐correcting FIR fluxes and show that the data are best fitted by a quiescent spiral template (M51) rather than a warm starburst (M82) or ultra‐luminous infrared galaxy (Arp 220), implying a predominance of cold dust in massive galaxies at high redshift. In contrast, we measure total infrared luminosities that are consistent with high star‐formation rates. We observe that the FRC index ( q ) does not evolve significantly over   z = 0–2  when computed from  K ‐corrected 24‐ or 160‐μm photometry, but that using 70‐μm fluxes leads to an apparent decline in  q  beyond   z ∼ 1 . This suggests some change in the SED at high redshift, either a steepening of the spectrum at rest‐frame  ∼25–35 μ m or a deficiency at  ∼70 μ m leading to a drop in the total infrared–radio ratios. We compare our results to other work in the literature and find synergies with recent findings on the high‐redshift FRC, high specific star formation rates of massive galaxies and the cold dust temperatures in these galaxies.

Evolution of the far‐infrared–radio correlation and infrared spectral energy distributions of massive galaxies over z = 0–2