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We study the radio--far infrared (FIR) correlation in "blue cloud" galaxieschosen from the PRism MUltiobject Survey (PRIMUS) up to redshift ($z$) of 1.2in the XMM-LSS field. We use rest-frame emission at 1.4 GHz in the radio andboth monochromatic (at 70$\mu$m) and bolometric (between $8-1000~\mu$m)emission in the FIR. To probe the nature of the correlation up to $z\sim1.2$,where direct detection of blue star-forming galaxies is impossible with currenttechnology, we employ the technique of image stacking at 0.325 and 1.4 GHz inthe radio and in six infrared bands, viz. 24, 70, 160, 250, 350 and $500~\mu$m.For comparison, we also study the correlation for more luminous galaxies thatare directly detected. The stacking analysis allows us to probe the radio--FIRcorrelation for galaxies that are up to 2 orders of magnitude fainter than theones detected directly. The $k-$correction in the infrared wavebands isobtained by fitting the observed spectral energy distribution (SED) with acomposite mid-IR power law and a single temperature greybody model. We findthat the radio luminosity at 1.4 GHz ($L_{\rm 1.4GHz}$) is strongly correlatedwith monochromatic FIR luminosity at 70 $\mu$m ($L_{\rm 70\mu m}$) having slope$1.09\pm0.05$ and with bolometric luminosity ($L_{\rm TIR}$) having slope$1.11\pm0.04$. The quantity $q_{\rm TIR} (=\log_{10}[L_{\rm TIR}/(3.75\times10^{12} L_{\rm 1.4 GHz})])$ is observed to decrease with redshift as $q_{\rmTIR} \propto (1+z)^{-0.16\pm0.03}$ probably caused due to the non-linear slopeof the radio--FIR correlation. Within the uncertainties of our measurement andthe limitations of our flux-limited and color-selected sample, we do not findany evolution of the radio--FIR correlation with redshift.

Radio--Far infrared correlation in "blue cloud" galaxies with 0