Table 1.
Best-fit results.
| NB |
FB |
|||||||
|---|---|---|---|---|---|---|---|---|
| Model 2A ( ⋆ ) | Model 2B (⋄) | Model 3A ( † ) | Model 3B ( ‡ ) | Model 2A ( ⋆ ) | Model 2B (⋄) | Model 3A ( † ) | Model 3B ( ‡ ) | |
| Component | ||||||||
| TBABS | ||||||||
| nH (1022) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) | 0.3 (frozen) |
| EXPABS | ||||||||
| LowECut (keV) | 3 kT | kTbb | 3 kT | kTbb | ||||
| POWERLAW | ||||||||
| PhoIndex |
 |
2 ± 2 | 2 ± 2 | 2 ± 2 | ||||
| norm | > 0.04 | < 17 | < 32 | < 123 | ||||
| Fpow (×10−9 erg cm2 s−1) | 2.85 | 1.06 | 0.78 | 1.77 | ||||
| GAUSSIAN | ||||||||
| ElineKα (keV) | 6.62 ± 0.03 | 6.64 ± 0.03 |
 |
6.64 ± 0.03 | 6.60 ± 0.03 | 6.63 ± 0.03 | 6.60 ± 0.03 | 6.63 ± 0.03 |
| σKα (keV) |
 |
 |
 |
0.35 ± 0.04 | 0.33 ± 0.04 | 0.28 ± 0.04 |
 |
0.29 ± 0.04 |
| norm | 0.12 ± 0.01 | 0.12 ± 0.01 |
 |
0.127 ± 0.008 | 0.16 ± 0.02 | 0.13 ± 0.02 |
 |
0.13 ± 0.02 |
| EqWKα (eV) |
 |
 |
 |
 |
||||
| GAUSSIAN | ||||||||
| ElineKβ | 7.7 ± 0.1 | 7.75 ± 0.09 | 7.8 ± 0.1 | 7.77 ± 0.09 | 7.8 ± 0.2 | 7.8 ± 0.3 | 7.8 ± 0.2 | 7.9 ± 0.2 |
| norm | 0.022 ± 0.006 |
 |
 |
0.031 ± 0.004 | 0.016 ± 0.008 | 0.010 ± 0.005 | 0.018 ± 0.008 | 0.013 ± 008 |
| EqWKβ (eV) | 17 ± 4 | 21 ± 5 |
 |
 |
||||
| BBODYRAD | ||||||||
| kT (keV) | 1.29 ± 0.02 | 1.26 ± 0.02 | 1.51 ± 0.01 |
 |
||||
| Rbb (km) | 13 ± 1 | 13 ± 2 | 13 ± 1 | 13 ± 1 | ||||
| DISKBB | ||||||||
| kTin (keV) |
 |
0.43 ± 0.03 | 0.62 ± 0.03 |
 |
||||
| Rdisc (km) |
 |
 |
 |
107 ± 21 | ||||
| Fbb (10−7 erg cm2 s−1) | 0.61 | 4.21 | 1.19 | 2.76 | ||||
| NTHCOMP | ||||||||
| Γ | 2.06 ± 0.01 |
 |
 |
 |
 |
 |
 |
 |
| kTe (keV) |
 |
 |
2.88 ± 0.04 |
 |
2.99 ± 0.04 |
 |
2.94 ± 0.06 |
 |
| kTbb (keV) | < 0.33 |
 |
< 0.34 | 0.84 ± 0.02 | < 0.38 |
 |
< 0.37 |
 |
| norm |
 |
 |
 |
 |
 |
 |
 |
 |
| FComp (10−7 erg cm2 s−1) | 5.55 | 3.21 | 6.8 | 3.67 | ||||
| τ | 9.8 ± 0.2 | 7.58 ± 0.09 | 9.6 ± 0.2 | 6.2 ± 0.3 | ||||
| Fbol (10−7 erg cm2 s−1) | 6.20 | 7.55 | 8.03 | 6.46 | ||||
| χ2/d.o.f. | 1395/1181 | 1339/1181 | 1336/1179 | 1307/1179 | 1181/1099 | 1154/1099 | 1167/1097 | 1146/1097 |
Notes. ( ⋆ )Model 2A:TBabs*(Gaussian+Gaussian+bbodyrad+nthComp). (⋄)Model 2B:TBabs*(Gaussian+Gaussian+diskbb+nthComp). ( † )Model 3A: TBabs*(expabs*powerlaw+Gaussian+Gaussian+bbodyrad+nthComp). ( ‡ )Model 3B: TBabs*(expabs*powerlaw+Gaussian+Gaussian+diskbb+nthComp). The uncertainties are reported at the 90% confidence level. The spectral parameters are defined as in XSPEC. To estimate the value of the blackbody radius Rbb and the inner radius of the accretion disc Rdisc, we assumed a distance to the source of 2.8 ± 0.3 kpc (Bradshaw et al. 2003) and an inclination angle with respect to the line of sight θ = 46° ±6° (Fomalont et al. 2001). Fpow, Fbb, and FComp are the unabsorbed bolometric flux of the power law, the thermal component, and the Comptonised component in the 0.1−100 keV energy range, respectively. Fbol is the total unabsorbed bolometric flux in the 0.1−100 keV energy range.
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