Upper panel: distribution of total IR luminosities () of the GOODS-Herschel galaxies classified as “clean” as a function of redshift. The solid and dashed red lines are the detection limits of the GOODS-S and GOODS-N images respectively. Spectroscopic and photometric redshifts are shown with filled and open dots respectively. Bottom panel: IR8 ratio (=/L8) as a function of redshift. The solid and dashed horizontal black lines are the median and 16th and 84th percentiles of the distribution (Eq. (3)), i.e., IR8 = 4.9 [−2.2, + 2.9] . The solid and dashed red lines show the detection limits of the GOODS-S and GOODS-N images above z = 1.5. The sliding median of the sources detected by Herschel is shown with black open circles connected with a solid line. A weighted combination of detections with stacked measurements (as in Fig. 6 and as described in Sect. 4.2) is shown with open yellow triangles (both fields combined).
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