Table 3.
Fit results for the Crab nebula observations under variations of the analysis method assuming a point source with an exponentially cut-off power-law spectrum.
| Analysis method | TS | Nsrc | k0 | Γ | Ec |
|---|---|---|---|---|---|
| H.E.S.S. published (a) | n.c. | 4283 | 3.84 ± 0.09 | 2.41 ± 0.04 | 15.1 ± 2.8 |
| Unbinned | 2030.6 | 686 | 5.0 ± 0.4 | 2.2 ± 0.2 | 7.4 ± 3.2 |
| Joint binned | 1967.5 | 664 | 5.0 ± 0.4 | 2.2 ± 0.2 | 6.9 ± 2.9 |
| Stacked binned | 1918.1 | 651 | 4.8 ± 0.4 | 2.1 ± 0.2 | 6.2 ± 2.5 |
| Joint On-Off (wstat) | 1134.3 | 562 | 5.0 ± 0.4 | 2.2 ± 0.2 | 6.8 ± 3.4 |
| Joint On-Off (cstat) | 996.1 | 549 | 4.8 ± 0.4 | 2.2 ± 0.2 | 8.0 ± 4.6 |
| Stacked On-Off (wstat) | 1359.5 | 575 | 5.0 ± 0.4 | 2.2 ± 0.2 | 7.4 ± 3.6 |
| Stacked On-Off (cstat) | 1102.7 | 553 | 4.8 ± 0.4 | 2.2 ± 0.2 | 7.2 ± 3.5 |
Notes. TS is the Test Statistic and Nsrc is the number of events attributed to the source model 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 is given in units of 10−11 ph cm−2 s−1 TeV−1 and Ec in units of TeV.
Values are from Aharonian et al. (2006a) for their dataset III which covers the period during which the observations of the H.E.S.S. public data release were taken. “n.c.” signals that the information was not communicated in the publication.
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