An evolution of the infrared-radio correlation at very low flux densities?
Corresponding Author
R. J. Beswick
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
E-mail: [email protected]Search for more papers by this authorT. W. B. Muxlow
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorH. Thrall
Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorA. M. S. Richards
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorS. T. Garrington
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorCorresponding Author
R. J. Beswick
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
E-mail: [email protected]Search for more papers by this authorT. W. B. Muxlow
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorH. Thrall
Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorA. M. S. Richards
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorS. T. Garrington
MERLIN/VLBI National Facility, Jodrell Bank Observatory, The University of Manchester, Macclesfield, Cheshire, SK11 9DL
Search for more papers by this authorABSTRACT
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.
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