Fig. 1

image

VHE γ-ray images of the GC region in Galactic coordinates and smoothed with the H.E.S.S. PSF. Top: γ-ray significance map is shown. Bottom: residual significance map after subtraction of the two point sources G0.9+0.1 and HESS J1745−290 is shown. The cyan contours indicate the density of molecular gas as traced by the CS brightness temperature integrated over the local standard of rest (LSR) velocity from −200 to 200 km s−1 (Tsuboi et al. 1999) and smoothed with the H.E.S.S. PSF (0.077°). The outer contour level is 36 K km s−1, which is about six times the noise level (Tsuboi et al. 1999). The position of the new H.E.S.S. source HESS J1746−285, which is coincident with the GC radio arc (Yusef-Zadeh et al. 1984), is indicated with a black cross.

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