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Table 1.
Properties of the defined HID regions.
| Region | Exposure (ks) | Segments | kTdbb (keV) | Γ |
|---|---|---|---|---|
| Z1 | 89.3 | 698 | 0.22 ± 0.02 | < 1.7 |
| Z2 | 54.3 | 424 | 0.23 ± 0.01 | 1.7 − 1.8 |
| Z3 | 75.0 | 586 | 0.25 ± 0.01 | 1.8 − 1.9 |
| Z4 | 33.0 | 258 | 0.25 ± 0.02 | 1.9 − 2.0 |
| Z5 | 12.8 | 100 | 0.26 ± 0.02 | 2.0 − 2.1 |
| Z6 | 14.5 | 113 | 0.29 ± 0.02 | 2.1 − 2.2 |
| Z7 | 15.9 | 124 | 0.32 ± 0.01 | 2.2 − 2.3 |
| Z8 | 8.6 | 67 | 0.34 ± 0.01 | 2.3 − 2.4 |
| Z9 | 12.4 | 97 | 0.38 ± 0.02 | 2.4 − 2.6 |
| Z10 | 65.9 | 515 | 0.42 ± 0.02 | > 2.6 |
Notes. Summary of the properties of each identified region of the HID of Cygnus X-1: total accumulated exposure time (ks), total number of accumulated 128 s segments, average and standard deviation of the disc-black body temperature and power-law index intervals.
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