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) |
| ℓ = 0.86° | |||
| G0.9+0.1 | b = 0.069° | – | 0.88 ± 0.04stat ± 0.25sys |
| ℓ = 359.94° | |||
| HESS J1745−290 | b = −0.05° | – | 2.9 ± 0.4stat ± 0.8sys |
| Dense Gas (DGC) | ℓ = 0°, b = 0° |  |
4.3 ± 0.9stat ± 1.5sys |
| Central (CC) | ℓ = 0°, b = 0° |  |
1.03 ± 0.05stat ± 0.25sys |
 |
|||
| Large Scale (LSC) | ℓ = 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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