Open Access

Fig. 15.


HE and VHE γ-ray spectra of PKS 1510–089 during the flare night, JD 2457539. The Fermi-LAT butterflies are integrated over the precise H.E.S.S. (red, left panel) and MAGIC (green, right panel) observation windows and are plotted up to the highest detected photon energy. The VHE γ-ray spectra are corrected for the EBL absorption with the model of Franceschini et al. (2008), with the H.E.S.S. spectrum in red and the MAGIC spectrum in green. The lines mark the best-fit spectra for combined Fermi-LAT and H.E.S.S. and MAGIC fits for the BLR ring geometry and different intrinsic spectra: a power law (PL), power law with sub-exponential cut-off (EPL), and a broken power law (BPL). In the PL case, curvature is only provided by the BLR absorption, whereas the EPL and BPL models include intrinsic spectral curvature. The best-fit values of the distance r from the black hole are provided in the legend.

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