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In this paper, we investigate the radio‐mid‐infrared (MIR) correlation at very low flux densities using extremely deep 1.4‐GHz subarcsec angular resolution Multi‐Element Radio‐Linked Interferometer + Very Large Array observations of a  field centred upon the  Hubble Deep Field ‐North, in conjunction with  Spitzer  24‐μm data. From these results, the MIR‐radio correlation is extended to the very faint (∼μJy) radio source population. Tentatively, we detect a small deviation from the correlation at the faintest infrared flux densities. We suggest that this small observed change in the gradient of the correlation is the result of a suppression of the MIR emission in faint star‐forming galaxies. This deviation potentially has significant implications for using either the MIR or non‐thermal radio emission as a star formation tracer of very low luminosity galaxies.

An evolution of the infrared‐radio correlation at very low flux densities?