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Table 3.
Best-fit parameters of the final BORUS model shown in Eq. (4).
| Parameter | Epoch 1 | Epoch 2 | Epoch 3 | Epoch 4 | Epoch 5 |
|---|---|---|---|---|---|
| Central source (zcutoffpl) | |||||
| Γ | − | − | − |
 |
− |
| norm (10−3 photons cm−2 s−1 keV−1) |
 |
 |
 |
 |
 |
| Fscat/Fnucl | − | − | − |
 |
− |
| Central source (nthcomp) | |||||
| Γ | − | − | − |
 |
− |
| kT (keV) | − | − | − |
 |
− |
| Neutral absorber | |||||
| Absorption (zphabs) | |||||
| NH (1023 cm−2) | 2.7 ± 0.2 | 2.7 ± 0.3 | 2.8 ± 0.2 | 3.0 ± 0.2 | 3.4 ± 0.3 |
| Reflection (borus02) | |||||
| NH (1024 cm−2) | − | − | − |
 |
− |
| Covering factor (Cf) | − | − | − |
 |
− |
| Ionized absorbers (xstar) | |||||
| Zone 1 (external) | |||||
| NH (1023 cm−2) | − | − | − |
 |
− |
| log ξ (erg cm s−1) | − | − | − |
 |
− |
| Zone 2 (internal) | |||||
| NH (1023 cm−2) | < 2.2 | < 1.4 | 4 ± 2 |
 |
 |
| log ξ (erg cm s−1) | − | − | − |
 |
− |
| v/c | 0 | 0 | 0 | 0 | 0.21 ± 0.02 |
Notes. The goodness of fit is χ2/d.o.f. = 923/901. The NTHCOMP parameters are taken from the best-fit model shown in Eq. (6), assuming a Comptonized continuum produced by a spherical corona.
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