Table 3
Parameters of the spectral fits of the entire SNR and results of the likelihood ratio tests for each of the models from Table 2.
| Model | Φ0 [cm-2 s-1 TeV-1] | Γ | β | Ecut [TeV] | logL | NFP | Significance |
|---|---|---|---|---|---|---|---|
| PL | (27.4 ± 0.9) × 10−12 | 2.30 ± 0.03 | n/a | n/a | − 51.717 | 2 | n/a |
| CPL | (28.8 ± 1.1) × 10−12 | 1.89 ± 0.07 | 0.23 ± 0.04 | n/a | − 24.567 | 3 | 7.3σ |
| ECPL | (32.2 ± 1.5) × 10−12 | 1.81 ± 0.08 | n/a | 6.7 ± 1.2 | − 21.623 | 3 | 7.7σ |
Notes. The central section of the table lists the fit parameters. In the case of the power law with exponential cutoff, Ecut is shown instead of the fitted parameter λ = 1∕Ecut. The quoted errors represent 1σ statistical uncertainties. In all cases the reference energy E0 was chosen to be 1 TeV. The right section of the table shows the results of the likelihood ratio test in order to check for the existence of a curvature in the spectrum. The logarithm of the likelihood L, the number of free parameters NFP, and the equivalent significance of the probability of the test in Gaussian standard deviations σ are shown for each fitted model. The test results apply to the comparison of a certain model with respect to the simpler (i.e., power law) model.
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