Table 4.
Best-fit parameters of the observations in the two regimes.
| HHL | SLL | HHL | SLL | |
|---|---|---|---|---|
| +cutoffpl | +cutoffpl | |||
| NH (1020 cm−2) |
 |
 |
 |
9.40 ± 0.03 |
| kTsoft (keV) |
 |
 |
 |
0.39 ± 0.09 |
| Norm. |
 |
 |
 |
 |
| kThard (keV) |
 |
 |
 |
 |
| Norm. (10−2) |
 |
 |
 |
 |
| Γ | – | – | 0.38 | 0.38 |
| Ecut (keV) | – | – | 4.3 | 4.3 |
| Norm. (10−5) | – | – | 2.8 (a) |
 |
| Ftot (10−12 erg cm−2 s−1) | 3.06 ± 0.03 | 1.57 ± 0.02 | 3.06 ± 0.03 | 1.64 ± 0.02 |
| Fcutoff/Ftot | – | – | 0.013 (a) | 0.50 ± 0.02 |
| LX (1039 erg s−1) | 4.77 ± 0.05 | 2.44 ± 0.03 | 4.77 ± 0.05 | 2.56 ± 0.03 |
| χ2/d.o.f. | 1220.12/1153 | 884.20/832 | 1220.11/1152 | 880.08/831 |
| n.h.p. (b) | 0.083 | 0.102 | 0.08 | 0.116 |
Notes. The unabsorbed X-ray fluxes and luminosities are in the 0.3−10 keV range, while the flux ratio Fcutoff/Ftot is computed in the range 0.3−40 keV, for the purpose of comparison with Walton et al. (2018a). The cut-off power law parameters, except the normalisation, are frozen to the best-fit ones of the SLL regime obtained using the NuSTAR dataset; the interstellar absorption is fixed to NH = 9.8 × 1020 cm−2 (G21). Errors are at 90% confidence level.
The null hypothesis probability (n.h.p.) is the probability of the observed data being drawn from the model, for a certain value of the χ2 and the degrees of freedom (d.o.f.). In the present work, we chose the common threshold of 0.05 and, hence, a fit with n.h.p. > 0.05 can be considered statistically acceptable.
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