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Fig. 3

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The low-energy slope α of the fast cooling synchrotron spectrum in the presence of inverse Compton scatterings in Klein-Nishina regime. In the wm − YTh plane, the value of the photon index α of the synchrotron spectrum below the peak of νFν is color-coded. All spectra have been computed numerically using a detailed radiative code including synchrotron radiation and inverse Compton scatterings (see text). Black thick lines of constant ratio Lic/Lsyn are plotted on top of this diagram. Cases where Lic/Lsyn > 5 in the top-left corner are not plotted as we focus in this paper on situations where the synchrotron component is dominant. In addition, thin dashed lines show the location of regions IIb and IIc from Nakar et al. (2009), where a slope α → −1 is predicted.

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