Table 1
Spatial models tested for the GeV γ-ray emission above 20 GeV.
| Morphology (>20 GeV) a | TS b | R68 for SrcFermi | R68 for SrcVERITAS | Ndf c | ΔAIC d |
|---|---|---|---|---|---|
| Model 1 (4FGL-DR4) | 770 | 0.517° | − | 5 | 0 |
| Model 2 (Disk + point) | 839 | 0.471° | − | 9 | −61 |
| Model 3 (Gaussian + point) | 846 | 0.578° | − | 9 | −68 |
| Model 4 (Two Gaussians) | 872 | 0.622° | 0.151° | 10 | −92 |
| Model 5 (Gaussian + VERITAS circle fixed) | 859 | 0.622° | 0.23° | 4 | −91 |
| Model 6 (Gaussian + VERITAS ellipse fixed) | 857 | 0.622° | (0.29° × 0.19°) e | 4 | −89 |
| Model 7 (Gaussian + MAGIC fixed) | 847 | 0.622° | 0.24°, 0.18° | 4 | −79 |
| Model 8 (Three Gaussians) | 849 | 0.630° | 0.174°, 0.213° | 15 | −59 |
Notes. (a) 'Fixed'in this column means that the spatial extension parameters were fixed to the TeV source measurement, as mentioned in Section 2.2. (b) For the global model rather than individual sources. (c) Degrees of freedom. (d) Calculated with respect to model 1. (e) Major axis times minor axis for the ellipse.
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