Table 2.
Results of the energy cutoff analysis for 25 unidentified γ-ray sources in the HGPS catalog.
| Source | Ecut, γ (TeV) | Sγ | Ecut, h (TeV) | Emax (TeV) | Γ | N | p-value | T (h) |
|---|---|---|---|---|---|---|---|---|
| HESS J1800−240 | 34.7 | 0.0 | 510.1 | 12 | 2.44 ± 0.03 | 5 | 9.6e−01 | 10 |
| HESS J1641−463 | 21.3 | 0.1 | 184.9 | 13 | 2.38 ± 0.03 | 5 | 9.8e−01 | 27 |
| HESS J1908+063 | 31.1 | 1.0 | 154.0 | 30 | 2.22 ± 0.04 | 6 | 8.2e−01 | 12 |
| HESS J1852−000 | 29.2 | 0.0 | 119.7 | 30 | 2.12 ± 0.06 | 6 | 8.0e−01 | 23 |
| HESS J1634−472 | 20.3 | 0.5 | 107.8 | 30 | 2.30 ± 0.05 | 6 | 2.8e−01 | 14 |
| HESS J1828−099 | 14.5 | 0.0 | 64.6 | 12 | 2.19 ± 0.07 | 5 | 8.3e−01 | 20 |
| HESS J1023−575 | 13.5 | 2.0 | 35.3 | 32 | 2.38 ± 0.07 | 6 | 2.1e−01 | 23 |
| HESS J1858+020 | 10.6 | 0.3 | 33.5 | 13 | 2.30 ± 0.04 | 5 | 9.5e−01 | 22 |
| HESS J1841−055 | 8.4 | 2.7 | 29.9 | 12 | 2.42 ± 0.07 | 5 | 9.8e−03 | 14 |
| HESS J1503−582 | 8.3 | 0.0 | 28.4 | 14 | 2.7 ± 0.1 | 5 | 3.4e−01 | 18 |
| HESS J1507−622 | 10.6 | 2.4 | 26.3 | 15 | 2.10 ± 0.07 | 5 | 4.5e−01 | 13 |
| HESS J1646−458 | 7.4 | 0.0 | 22.7 | 13 | 2.6 ± 0.1 | 5 | 7.1e−01 | 10 |
| HESS J1457−593 | 7.7 | 0.0 | 18.1 | 15 | 2.6 ± 0.1 | 5 | 7.3e−01 | 4 |
| HESS J1843−033 | 9.9 | 2.8 | 16.6 | 30 | 2.2 ± 0.1 | 6 | 1.7e−03 | 17 |
| HESS J1018−589 B | 8.6 | 2.3 | 14.7 | 15 | 2.1 ± 0.1 | 5 | 6.3e−01 | 21 |
| HESS J1632−478 | 5.3 | 0.1 | 10.0 | 13 | 2.46 ± 0.06 | 5 | 4.0e−01 | 15 |
| HESS J1741−302 | 4.5 | 0.0 | 9.2 | 7 | 2.2 ± 0.2 | 6 | 5.3e−01 | 145 |
| HESS J1702−420 | 5.2 | 0.2 | 9.1 | 13 | 2.1 ± 0.1 | 5 | 1.7e−01 | 4 |
| HESS J1809−193 | 3.4 | 1.0 | 5.0 | 12 | 2.3 ± 0.1 | 5 | 1.6e−01 | 10 |
| HESS J1616−508 | 3.2 | 1.1 | 3.8 | 13 | 2.3 ± 0.1 | 5 | 1.1e−02 | 4 |
| HESS J1808−204 | 2.1 | 0.0 | 2.7 | 12 | 2.1 ± 0.2 | 5 | 1.3e−01 | 37 |
| HESS J1026−582 | 5.0 | 2.0 | 2.3 | 32 | 2.0 ± 0.2 | 5 | 7.0e−03 | 22 |
| HESS J1804−216 | 1.3 | 1.1 | 1.8 | 12 | 2.7 ± 0.1 | 5 | 2.6e−04 | 19 |
| HESS J1708−443 | 2.2 | 1.2 | 1.3 | 13 | 2.0 ± 0.2 | 5 | 4.2e−02 | 8 |
| HESS J1746−285 | 1.2 | 0.6 | 0.7 | 6 | 2.0 ± 0.2 | 7 | 4.0e−01 | 259 |
Notes. The source name refers to the HGPS (Abdalla et al. 2018). Ecut, γ is the lower limit on the exponential energy cutoff of the γ-ray spectrum (Eq. (3) with β = 1). Sγ is the significance of an F-test for a power-law model against an exponential cutoff in the γ-ray spectrum (again modeled by Eq. (3) with β = 1). Ecut, h is the upper limit on the energy cutoff of a hadron population in a purely hadronic model (Eq. (1)). Emax is the maximum bin-center energy of the spectral points for the source used in the analysis. Γ is the power-law index of the best least-square fit to the public HGPS data. Errors are statistical only. N is the number of spectral points for the source used in the analysis. The p-values refer to a χ2 goodness-of-fit test for the power-law model. The HESS livetime used for the spectral analysis of the source in the HGPS is indicated by T. All upper limits are at 90% CL. The results are in descending order in Ecut, h.
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