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The infrared-radio correlation (IRRC) underpins many commonly used radioluminosity-star formation rate (SFR) calibrations. In preparation for the newgeneration of radio surveys we revisit the IRRC of low-$z$ galaxies by (a)drawing on the best currently available IR and 1.4 GHz radio photometry, plusancillary data over the widest possible area, and (b) carefully assessingpotential systematics. We compile a catalogue of $\sim$9,500 z $<$ 0.2 galaxiesand derive their 1.4 GHz radio ($L_{\mathrm{1.4}}$), total IR, andmonochromatic IR luminosities in up to seven bands, allowing us to parameterizethe wavelength-dependence of monochromatic IRRCs from 22-500 $\mu$m. For thefirst time for low-$z$ samples, we quantify how poorly matched IR and radiosurvey depths bias measured median IR/radio ratios,$\overline{q}_{\mathrm{TIR}}$, and discuss the level of biasing expected forlow-z IRRC studies in ASKAP/MeerKAT fields. For our subset of $\sim$2,000high-confidence star-forming galaxies we find a median$\overline{q}_{\mathrm{TIR}}$ of 2.54 (scatter: 0.17 dex). We show that$\overline{q}_{\mathrm{TIR}}$ correlates with $L_{\mathrm{1.4}}$, implying anon-linear IRRC with slope 1.11$\pm$0.01. Our new $L_{\mathrm{1.4}}$-SFRcalibration, which incorporates this non-linearity, reproduces SFRs frompanchromatic SED fits substantially better than previous IRRC-based recipes.Finally, we match the evolutionary slope of recently measured$\overline{q}_{\mathrm{TIR}}$-redshift trends without having to invoke redshiftevolution of the IRRC. In this framework, the redshift evolution of$\overline{q}_{\mathrm{TIR}}$ reported at GHz frequencies in the literature isthe consequence of a partial, redshift-dependent sampling of a non-linear IRRCobeyed by low-$z$ {\it and} distant galaxies.

monthly notices of the royal astronomical society

The non-linear infrared-radio correlation of low-z galaxies:  implications for redshift evolution, a new radio SFR recipe, and how to  minimize selection bias