Large field-of-view (FoV; 5.1° × 5.1°) VHE γ-ray image of the region containing H.E.S.S. J1708−443. The Gaussian-smoothed (σ = 0.10°) VHE γ-ray excess from Fig. 1 (left) is shown in color. The white contours indicate the intensity of the 330 MHz radio emission detected with Very Large Array (VLA) observations (see also the green contours in Fig. 1, left). The dotted white box represents the FoV covered by the VLA observations. Outside of this region, green contours indicate the lower-resolution 2.4 GHz radio continuum data (Duncan et al. 1995) taken with the Parkes telescope; these observations have a half-power beamwidth of ~ 10.4′. This image also shows the approximately ring-shaped region used for normalizing the background in the ON-OFF background method (see Sect. 2.3); this region is delimited by the large dashed white circles, excluding the known TeV source H.E.S.S. J1702−420 located toward the Northwest. The Galactic plane is also located toward the NW and is indicated by a thick black dotted line.
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