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Fig. 1

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H.E.S.S. excess map of the region around Wd 1 corrected for the camera acceptance, in units of equivalent on-axis VHE γ-ray events per arcmin2 and obtained with the template background method. The image is smoothed with a 2D Gaussian kernel with a variance of 0.12° to reduce the effect of statistical fluctuations. Significance contours between 4σ and 8σ are overlaid in black, obtained by integrating events within a radius of 0.22 degrees at each given position. The green star marks the position of Wd 1, the white cross the best fit position of the VHE γ-ray emission and the black dashed line the Galactic plane. The inlay in the lower left corner represents the size of a point-like source as it would have been seen by H.E.S.S. for this analysis and the same smoothing, normalised to the maximum of HESS J1646–458. The dotted white circle has a radius of 1.1° and denotes the region which was used for the spectral reconstruction of the VHE γ-ray emission. Note that the bright region in the lower right corner is the source HESS J1640–465 detected during the GPS (Aharonian et al. 2006c).

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