An evolution of the IR-Radio correlation at very low flux densities?
Abstract
In this paper we investigate the radio-MIR correlation at very low flux densities using extremely deep 1.4 GHz sub-arcsecond angular resolution MERLIN+VLA observations of a 8'.5 by 8'.5 field centred upon the Hubble Deep Field North, in conjunction with Spitzer 24micron data. From these results the MIR-radio correlation is extended to the very faint (~microJy) radio source population. Tentatively we detect a small deviation from the correlation at the faintest IR 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.
Keywords
Cite
@article{arxiv.0801.1035,
title = {An evolution of the IR-Radio correlation at very low flux densities?},
author = {R. J. Beswick and T. W. B. Muxlow and H. Thrall and A. M. S. Richards and S. T. Garrington},
journal= {arXiv preprint arXiv:0801.1035},
year = {2009}
}
Comments
Accepted for publication in MNRAS, 14 pages, 9 Figures (7 colour), 2 tables