An evolution of the IR-Radio correlation?
Abstract
Using extremely deep (rms 3.3 microJy/bm) 1.4GHz sub-arcsecond resolution MERLIN + VLA radio observations of a 8'.5 by 8'.5 field centred upon the Hubble Deep Field North, in conjunction with Spitzer 24 micron data we present an investigation of the radio-MIR correlation at very low flux densities. By stacking individual sources within these data we are able to extend the MIR-radio correlation to the extremely faint (~microJy and even sub-microJy) radio source population. Tentatively we demonstrate a small deviation from the correlation for the faintest MIR sources. 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 at low luminosities.
Cite
@article{arxiv.0801.1034,
title = {An evolution of the IR-Radio correlation?},
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:0801.1034},
year = {2009}
}
Comments
To Appear in The Modern Radio Universe: From Planets to Dark Energy Conference (Oct 1-5 2007, The University of Manchester) Editors: Beswick, Diamond & Schilizzi