Mean LFIR – to – L1.4 GHz ratio (qFIR) of galaxies as a function of Δlog(SSFR)MS, as derived from our stacking analysis. Hatched areas represent the regions of parameter space affected by incompleteness (see text and Fig. 4), while 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. In each panel, we show the median value (green dashed line), give the Spearman rank correlation (ρs) and the null hypothesis probability (Sig.) derived from data points in the region of parameter space not affected by incompleteness. Blue dot-dashed lines represent a redshift evolution of qFIR = 2.35 × (1 + z)-0.12. In the lower right part of each panel, we give the median uncertainty on our qFIR estimates. Vertical solid and dot-dashed lines show the localisation and the width of the MS of star formation. In the redshift bin with a statistically significant correlation (Sig.<5% and , see text), we plot (red long-dashed line) a linear fit, qFIR = (0.22 ± 0.07) × Δlog (SSFR)MS + (2.10 ± 0.05). The lower panel of each redshift bin shows the offset between the median qFIR of our data and the local value of qFIR(z = 0) ≈ 2.34, in bins of 0.2 dex.
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