Table 2.
Extension and localisation measurements as a function of energy with statistical and systematic errors.
| Energy (GeV) | Diff. | Ext. (R) (°) | TSext | RA | Dec | σExt, syst(°) |
|---|---|---|---|---|---|---|
| 1–3 | D1 | 1.11(10) | 132 | 18h23m12s(4m48s) | −13° 30′35″(5′24″) | 0.18 |
| D2 | 1.00(12) | 125 | 18h22m39s(4m48s) | −13° 24′00″(4′48″) | ||
| 3–10 | D1 | 1.43(11) | 270 | 18h23m43s(4m12s) | −13° 41′23″(4′48″) | 0.12 |
| D2 | 1.39(8) | 312 | 18h23m24s(3m36s) | −13° 43′12″(3′36″) | ||
| 10–32 | D1 | 1.47(8) | 357 | 18h24m43s(4m12s) | −13° 55′11″(4′48″) | 0.13 |
| D2 | 1.44(10) | 425 | 18h24m17s(3m36s) | −13° 52′11″(3′36″) | ||
| 32–100 | D1 | 1.04(9) | 300 | 18h25m31s(3m36s) | −14° 03′36″(4′12″) | 0.11 |
| D2 | 1.12(10) | 344 | 18h25m17s(4m12s) | −14° 01′47″(4′12″) | ||
| 100–1000 | D1 | 0.84(8) | 232 | 18h25m27s(4m48s) | −14° 00′00″(4′48″) | 0.08 |
| D2 | 0.91(8) | 205 | 18h25m14s(5m24s) | −13° 58′48″(5′24″) |
Notes. The analysis is performed using two different diffuse models, respectively, “D1” which is the diffuse template used in the 4FGL model (Abdollahi et al. 2020) and “D2” which is the diffuse template specifically developed for accurate analysis near the Galactic centre (Ackermann et al. 2017b). The extension is characterised by the 68% containment radius obtained from a 2D-Gaussian template fit. We estimated the systematic error of the extension σExt, syst, due to the diffuse model using Eq. (2).
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