We present a multi-wavelength analysis of star-forming galaxies in the massive cluster MS0451.6-0305 at z \sim 0.54 to shed new light on the evolution of the far-infrared-radio relationship in distant rich clusters .
We have derived total infrared luminosities for a spectroscopically confirmed sample of cluster and field galaxies through an empirical relation based on Spitzer MIPS 24 \upmu m photometry .
The radio flux densities were measured from deep Very Large Array 1.4 GHz radio continuum observations .
We find the ratio of far-infrared to radio luminosity for galaxies in an intermediate redshift cluster to be q _ { FIR } = 1.80 \pm 0.15 with a dispersion of 0.53 .
Due to the large intrinsic dispersion , we do not find any observable change in this value with either redshift or environment .
However , a higher percentage of galaxies in this cluster show an excess in their radio fluxes when compared to low redshift clusters ( 27 ^ { +23 } _ { -13 } \% to 11 \% ) , suggestive of a cluster enhancement of radio-excess sources at this earlier epoch .
In addition , the far-infrared-radio relationship for blue galaxies , where q _ { FIR } = 2.01 \pm 0.14 with a dispersion of 0.35 , is consistent with the predicted value from the field relationship , although these results are based on a sample from a single cluster .