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Table 5.
Best-fit parameters of polarization analysis with XSPEC.
| DU | Parameters | Obs. 1 | Obs. 2 |
|---|---|---|---|
| DU1 | NDU1 | 0.796 ± 0.006 | 0.798 ± 0.004 |
| gain slope |
 |
0.961 ± 0.003 | |
| gain offset (keV) | 0.13 ± 0.02 | 0.102 ± 0.015 | |
| DU2 | NDU2 | 0.772 ± 0.006 | 0.769 ± 0.004 |
| gain slope | 0.952 ± 0.003 | 0.960 ± 0.003 | |
| gain offset (keV) | 0.15 ± 0.02 | 0.131 ± 0.014 | |
| DU3 | NDU3 | 0.734 ± 0.005 | 0.736 ± 0.004 |
| gain slope | 0.976 ± 0.004 | 0.966 ± 0.003 | |
| gain offset (keV) | 0.10 ± 0.02 | 0.114 ± 0.015 | |
| Components | Parameters | Obs. 1 | Obs. 2 |
| polconst*(diskbb+[expabs*powerlaw](a)+thcomp*bbodyrad) | |||
| PD (%) | 3.7 ± 0.4 | 1.8 ± 0.4 | |
| PA (deg) | −9 ± 3 | −9 ± 6 | |
| χ2/d.o.f. | 1806/1799 | 1733/1711 | |
| polconst1*diskbb+polconst2*([expabs*powerlaw](a)+thcomp*bbodyrad) | |||
| polconst1 | PD (%) | 2.3 ± 0.9 | 1.8 ± 0.9 |
| PA (deg) | 21 ± 11 | 14 ± 15 | |
| polconst2 | PD (%) | 5.7 ± 1.4 | 4.3 ± 2.0 |
| PA (deg) | −16 ± 20 | −32 ± 14 | |
| χ2/d.o.f. | 1792/1806 | 1726/1718 | |
Notes.
(a)
The errors are at 90% confidence level (see Table 4 for the corresponding spectral analysis). Polarization is computed in the 2–8 keV energy range. expabs*powerlaw component was included only in Obs. 1.
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