Fig. 6

image

Very high-energy γ-ray spectrum of the region centred on the position of HESS J1746−285, fitted with the sum of two power laws. The GC ridge contribution is fixed and the intrinsic source spectrum of HESS J1746−285 is fitted to the data. In red, we show the fixed ridge power-law contribution to the total spectrum. The intrinsic spectrum of HESS J1746−285 was estimated to have a flux normalisation of F(1TeV) = (1.8 ± 0.5) × 10−13 cm−2 s−1 TeV−1 and an indexof 2.2 ± 0.2 for the energy range above 0.350 TeV. The errors include the uncertainty of the GC ridge emission, which are obtained by varying the ridge component parameters by their statistical errors.

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