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Fig. 15

image

Spectral analysis of VHE observations of the blazar PKS 1441+25. Full cyan squares are from Fermi and open cyan squares are from MAGIC observations by Ahnen et al. (2015). The data show a spectral steepening in the Fermi regime at ϵ ≃ 3 GeV (the best-fit power laws are shown in black and the spectral indices in the insert) and an exponential cutoff in the range covered by MAGIC data. We fit these data with an intrinsic spectrum as for an LSP-ISP blazar, red curve, while the best-fitting green line includes an EBL absorption as from the present paper. Blue data points are the corrected spectrum assuming an optical/near-IR EBL intensity a factor 1.5 larger than our best-guess estimate. The panel on top reports the absorption correction exp [τγγ].

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