Fig. 3
3.6 μm IR flux density versus redshift, adapted from Norris et al. (2011). Shown is the sample of HzRGs from Seymour et al. (2007) as black dots and the three IFRS whose redshifts are presented in this work as red crosses. The IFRS are located in the same parameter range as the HzRGs and seem to follow their S3.6 μm − z relation. It appears that IFRS define the lower bound of HzRGs.
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