Fig. 1
Illustration of the source selection scheme on the γ-ray excess image from a given region. The known H.E.S.S. sources HESS J1857+026 and HESS J1858+020 with their 80% flux containment radii are shown with a dashed circle. The de-selection region resulting from the algorithm explained inSect. 2 is shown with a solid curve. Because of the overlap with the de-selection region, the SNR G35.6 −0.4 is discarded whereas SNR G36.6 −0.7 is selected.
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