Table A.1.
Summary of VHE gamma-ray data sets used here.
| Data set | Start | End | χ2(dof) | α | ζ | Ref. |
|---|---|---|---|---|---|---|
| HEGRA (IACT) | 1997 | 2002 | 18(15) |
 |
1.197 ± 0.005 | (1) |
| H.E.S.S. (IACT) | 2003 | 2005 | 24(10) |
 |
1.065 ± 0.005 | (2) |
| MAGIC (IACT) | 2009 | 2011 | 11(13) |
 |
0.896 ± 0.006 | (3) |
| VERITAS (IACT) | 2009 | 2013 | 9(11) |
 |
1.038 ± 0.002 | (4) |
| HAWC (WCD) | 6/2015 | 12/2017 | 7(8) |
 |
1.093 ± 0.003 | (5) |
| MAGIC (VLZA) | 2014 | 2018 | 2(6) | 0.59 ± 0.25 | 1.09 ± 0.02 | (6) |
| Tibet ASγ (EAS, WCD) | 2014 | 2017 | 4(9) | 0.32 ± 0.15 | 1.06 ± 0.02 | (7) |
| VERITAS (flare) | 03/2013 | 03/2013 | 13(13) | 0.42 ± 0.17 | 1.09 ± 0.01 | (8) |
| H.E.S.S. II (flare) | 03/2013 | 03/2013 | 17(31) | 0.68 ± 0.3 | 0.96 ± 0.01 | (9) |
| H.E.S.S. II (IACT) | 11/2013 | 1/2014 | 93(37) |
 |
1.100 ± 0.007 | (10) |
| LHAASO (EAS, WCD) | 2019 | 2020 | 11(16) | 0.56 ± 0.06 | 0.932 ± 0.006 | (11) |
Notes. Listed data sets include imaging air Cherenkov telescopes’ (IACTs) observations as well as data taken with extended air shower front sampling (EAS) arrays with scintillators or water Cherenkov detectors (WCD). By observing sources with IACTs at very large zenith angles (VLZA) between 70° and 80°, the collection area at large energies beyond 10 TeV is substantially increased. The uncertainty on α is given for a 90 % confidence level and has been estimated from the discrete sampled values of α. For some data sets the χ2 curve is under-sampled while for others, the maximum range of α is not sufficient to cover the confidence interval.
Reference. (1) Aharonian et al. (2004), (2) Aharonian et al. (2006), (3) Aleksić et al. (2015), (4) Wells (2019), (5) Abeysekara et al. (2019), (6) MAGIC Collaboration (2020), (7) Amenomori et al. (2019), (8) Aliu et al. (2014), (i) H. E. S. S. Collaboration (2014), (9) Holler et al. (2015), Holler (2014), (10) LHAASO Collaboration (2021).
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