Left: the SFR − M_∗ relation for sources with S₁₀₀/S₂₄  >  43 at 1.1 < z < 1.7 (black circles). Orange dots indicate sources with spectroscopic redshift. Red cross corresponds to the ULIRG dropout that we presented in Sect. 3.3. The solid green line depicts the SFR − M_∗ correlation at z ~ 1.4 (Elbaz et al. 2011), while the dashed lines indicate its dispersion. Right: specific star formation rate (sSFR), as a function of redshift, for the same sample as in the left panel, as well as for the whole GOODS-H sample (grey dots). The gray thick line denotes the evolution of the sSFR with redshift, as derived by individual detections and stacking analysis of the GOODS-H sample by Elbaz et al. (2011). The blue shaded area along with the dashed gray lines which correspond to the dispersion of the evolution (~0.3 dex), indicate the region of main sequence galaxies. Sources with S₁₀₀/S₂₄  >  43 tend to be found above the blue shaded area, populating the starburst region. The green text indicates the position of Arp 220 and M 82 (shifted to z = 0.1 for clarity).