IRX–β relation for main sequence galaxies at z = 1.5 with colored points marking the values of the slope of the attenuation curve. The right-hand axis indicates the normalized slope of the attenuation curve. The parameter Σ is the ratio of the effective attenuation curve slope and the slope of the Calzetti et al. (2000) attenuation law (here −0.54 dex μm). In other words, log10Σ > 0 (resp. log10Σ < 0) indicates a steeper (resp. flatter) attenuation curve than Calzetti et al. (2000) attenuation curve. We compare with average IRX–β computed by Salmon et al. (2016) for attenuation curves estimated by Gordon et al. (2003; SMC), Calzetti et al. (2000) and Reddy et al. (2015). These three average relations are plotted with solid colored lines. As for the random galaxies sample, the color code is linked to the normalized slope of the attenuation curve.
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