Table 8.
Fit results for PKS 2155–304 for dataset T200 under variations of the spectral model component and analysis method assuming a point-source spatial model.
| PL | TS | Nsrc | k0 | Γ | F0.3 − 3TeV | |
|---|---|---|---|---|---|---|
| counts | ph cm−2 s−1 TeV−1 | erg cm−2 s−1 | ||||
| H.E.S.S. published (a) | n.c. | n.c. | (7.5 ± 0.1)×10−11 | 3.25 ± 0.01 | – | 4.1 × 10−10 |
| Unbinned | 46 992.5 | 8922 | (6.7 ± 0.2)×10−11 | 3.45 ± 0.02 | – | 4.1 × 10−10 |
| Joint binned | 43 417.4 | 8116 | (6.7 ± 0.2)×10−11 | 3.47 ± 0.03 | – | 4.1 × 10−10 |
| Stacked binned | 43 118.4 | 8071 | (6.5 ± 0.2)×10−11 | 3.48 ± 0.03 | – | 4.2 × 10−10 |
| Joint On-Off (wstat) | 17 799.2 | 7877 | (6.5 ± 0.2)×10−11 | 3.49 ± 0.03 | – | 4.1 × 10−10 |
| Joint On-Off (cstat) | 16 244.4 | 7488 | (6.5 ± 0.2)×10−11 | 3.49 ± 0.03 | – | 4.1 × 10−10 |
| Stacked On-Off (wstat) | 18 366.7 | 7887 | (6.6 ± 0.2)×10−11 | 3.48 ± 0.03 | – | 4.1 × 10−10 |
| Stacked On-Off (cstat) | 16 866.9 | 7511 | (6.5 ± 0.2)×10−11 | 3.49 ± 0.03 | – | 4.1 × 10−10 |
| EPL | TS | Nsrc | k0 | Γ | Ec | F0.3 − 3TeV |
| counts | ph cm−2 s−1 TeV−1 | TeV | erg cm−2 s−1 | |||
| H.E.S.S. published (a) | n.c. | n.c. | (2.1 ± 0.2)×10−10 | 2.65 ± 0.06 | 1.0 ± 0.1 | 4.3 × 10−10 |
| Unbinned | 47 087.2 | 8902 | (1.7 ± 0.2)×10−10 | 2.85 ± 0.08 | 1.1 ± 0.2 | 4.2 × 10−10 |
| Joint binned | 43 507.5 | 8097 | (1.8 ± 0.2)×10−10 | 2.82 ± 0.08 | 1.1 ± 0.2 | 4.2 × 10−10 |
| Stacked binned | 43 197.2 | 8056 | (1.6 ± 0.2)×10−10 | 2.89 ± 0.08 | 1.2 ± 0.2 | 4.2 × 10−10 |
| Joint On-Off (wstat) | 17 870.4 | 7872 | (1.6 ± 0.2)×10−10 | 2.91 ± 0.09 | 1.2 ± 0.2 | 4.2 × 10−10 |
| Joint On-Off (cstat) | 16 321.4 | 7480 | (1.7 ± 0.2)×10−10 | 2.87 ± 0.09 | 1.1 ± 0.2 | 4.2 × 10−10 |
| Stacked On-Off (wstat) | 18 437.9 | 7882 | (1.6 ± 0.2)×10−10 | 2.90 ± 0.09 | 1.2 ± 0.2 | 4.2 × 10−10 |
| Stacked On-Off (cstat) | 16 940.7 | 7503 | (1.7 ± 0.2)×10−10 | 2.88 ± 0.09 | 1.2 ± 0.2 | 4.2 × 10−10 |
| CPL | TS | Nsrc | k0 | Γ | β | F0.3 − 3TeV |
| counts | ph cm−2 s−1 TeV−1 | erg cm−2 s−1 | ||||
| H.E.S.S. published (a) | n.c. | n.c. | (7.5 ± 0.2)×10−11 | 3.69 ± 0.05 | −0.78 ± 0.07 | 4.3 × 10−10 |
| Unbinned | 47 091.7 | 8900 | (6.9 ± 0.2)×10−11 | 3.83 ± 0.05 | −0.35 ± 0.04 | 4.3 × 10−10 |
| Joint binned | 43 512.4 | 8097 | (7.0 ± 0.2)×10−11 | 3.83 ± 0.06 | −0.37 ± 0.05 | 4.3 × 10−10 |
| Stacked binned | 43 199.5 | 8054 | (6.8 ± 0.2)×10−11 | 3.82 ± 0.05 | −0.35 ± 0.05 | 4.2 × 10−10 |
| Joint On-Off (wstat) | 17 873.3 | 7877 | (6.8 ± 0.2)×10−11 | 3.82 ± 0.06 | −0.34 ± 0.05 | 4.2 × 10−10 |
| Joint On-Off (cstat) | 16 322.0 | 7481 | (6.7 ± 0.2)×10−11 | 3.85 ± 0.06 | −0.36 ± 0.05 | 4.2 × 10−10 |
| Stacked On-Off (wstat) | 18 442.2 | 7887 | (6.9 ± 0.2)×10−11 | 3.81 ± 0.06 | −0.34 ± 0.05 | 4.2 × 10−10 |
| Stacked On-Off (cstat) | 16 944.1 | 7505 | (6.8 ± 0.2)×10−11 | 3.83 ± 0.06 | −0.35 ± 0.05 | 4.2 × 10−10 |
Notes. TS is the Test Statistic and Nsrc is the number of events attributed to the source within the analysis region, which is the full field of view for the 3D analyses and the On region for the On-Off analyses, k0, Γ, Ec, and β are the spectral parameters, where k0 is evaluated at 1 TeV. F0.3 − 3TeV is the resulting energy flux of PKS 2155–304 within 300 GeV and 3 TeV.
Values are from Table 1 of Aharonian et al. (2009). “n.c.” signals that the information was not communicated in the publication.
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