Table 1

Parameters describing the components for the final model.

Model Position Extension Flux
component (Galactic coordinates) (degrees) (10−12 cm−2 s−1 TeV −1)
= 0.86°
G0.9+0.1 b = 0.069° 0.88 ± 0.04stat ± 0.25sys
= 359.94°
HESS J1745−290 b = −0.05° 2.9 ± 0.4stat ± 0.8sys
Dense Gas (DGC) = 0°, b = 0° 4.3 ± 0.9stat ± 1.5sys
Central (CC) = 0°, b = 0° 1.03 ± 0.05stat ± 0.25sys
Large Scale (LSC) = 0°, b = 0° 2.68 ± 0.6stat ± 1.3sys
HESS J1746−285 0.24 ± 0.03stat ± 0.07sys

Notes. The background normalisation and the Galactic large-scale emission are unchanged by the fit and determined beforehand as explained in the main text. The two sources, G0.9+0.1 and HESS J1745−290, are modelled as point sources. The three components modelling the GC ridge emission are the dense gas component (DGC), the large-scale component (LSC), and the additional central component (CC). The parameter values and associated statistical errors at 68% confidence level are indicated; also listed are a systematic uncertainty, which was obtained by combining a 30% flux normalisation uncertainty (H.E.S.S. Collaboration 2018a) and a background uncertainty, which was obtained after performing the iterative fitting procedure including a variation of the background component level by ±2%.

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