Table 1.
Fit parameters of phase-averaged spectrum for various models.
| Parameter | cutoffpl | NPEX | pl × FDcut | diskbb + nthcomp |
|---|---|---|---|---|
| NH (1022 cm−2) | 4.9 ± 0.6 | 4.5 ± 0.6 | 5.9 ± 0.6 | 10 ± 4 |
| Γ | 0.53 ± 0.05 | 0.25 ± 0.04; −2 (a) |
 |
 |
| Efold (keV) |
 |
 |
9.24 ± 0.21 | |
| Ecut (keV) | ≤3.19 | |||
| Flux (×10−10 erg cm−2 s−1, 3−50 keV) | 4.153 ± 0.027 | 4.139 ± 0.026 | 4.144 ± 0.026 |
 |
| kTe (keV) |
 |
|||
| kTBB (keV) |
 |
|||
| kTdisk (keV) |
 |
|||
| Normdiskbb |
 |
|||
| EFe Kα (keV) (a)(c) | 6.404 | 6.404 | 6.404 | 6.404 |
| Flux (10−4 ph s−1 cm−2) | 1.23 ± 0.26 | 1.20 ± 0.26 | 1.25 ± 0.26 |
 |
| EFe Kβ (keV) (a)(c) | 7.058 | 7.058 | 7.058 | 7.058 |
| Flux (10−5 ph s−1 cm−2) (b) | 1.6 | 1.5 | 1.6 | 1.4 |
| EFe XXV (keV) (a)(c) | 6.7 | 6.7 | 6.7 | 6.7 |
| Flux (10−4 ph s−1 cm−2) | 1.20 ± 0.28 | 1.20 ± 0.28 | 1.19 ± 0.28 |
 |
| EFe XXVI (keV) (a)(c) | 6.98 | 6.98 | 6.98 | 6.98 |
| Flux (10−5 ph s−1 cm−2) | 3.3 ± 2.3 | 3.2 ± 2.3 | 3.8 ± 2.3 |
 |
| Egabs (keV) |
 |
|||
| σgabs (keV) (a) | 1.0 | |||
| Strength (keV) | ≤0.07 | |||
| Normalization | 0.0141 ± 0.0010 |
 |
 |
 |
| Constant | 0.965 ± 0.007 | 0.965 ± 0.007 | 0.965 ± 0.007 | 0.965 ± 0.007 |
| χ2 (d.o.f.) | 462.2/407 | 456.9/406 | 459.7/406 | 449.9/404 |
 |
1.14 | 1.13 | 1.13 | 1.11 |
Notes. The underlying function for all fit models is tbnew ∗ const ∗(continuum model + Fe−complex) where the continuum model is specified in the column header. The upper limit on a cyclotron line is discussed in Sect. 3.1. Uncertainties are at the 90% confidence level. We use wilm abundances and vern cross sections.
Tied to 0.13 ⋅ FluxFe Kα, see Palmeri et al. (2003).
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