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Fig. 9

image

Evolution of the LFIR– to –L1.4 GHz ratio, qFIR, with redshift, as inferred from our stacking analysis. Red circles and error bars correspond to the median and interquartile range observed in our study in regions of the parameter space not affected by incompleteness (green dashed lines in Fig. 8). The red line corresponds to a redshift-dependent fit to our data points, qFIR(z) = 2.35 × (1 + z)-0.12. The light grey region shows the value of qFIR observed by Yun et al. (2001) in a large sample of local star-forming galaxies, qFIR(zs0) = 2.34 ± 0.26. This local measurement is displayed over the entire range of redshift to highlight any possible redshift evolution of qFIR. The dark grey region presents results from Ivison et al. (2010b) using Herschel observations on a LIR-matched sample. Empty triangles show results from Bourne et al. (2011), as inferred using a stacking analysis on a stellar-mass-selected sample of galaxies. Stars present results obtained by Sargent et al. (2010) using a FIR/radio-selected sample of star-forming galaxies and applying a survival analysis to properly treat flux limits from non-detections.

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