Table 3.
Results of the model fits to the spectra of MR 2251−178.
| Parameter | Epoch A | Epoch B | Epoch C | Epoch D | Epoch E |
|---|---|---|---|---|---|
| Model I : const*TBabs*zTBabs(zpo+zgauss) | |||||
| Γ | 1.75 |
1.79 |
1.79 |
1.79 |
1.83 |
| NH(zTBabs) | – | – | – | – | 7.82 |
| E | – | – | – | 6.49 |
– |
| EW | < 35 | < 49 | < 34 | < 70 | < 46 |
| Norm | 142 |
177 |
162 |
162 |
84 |
| χ2/d.o.f. | 583/601 | 656/633 | 574/551 | 516/576 | 446/400 |
| CFPMA/FPMB | 1.02 |
1.00 |
1.03 |
1.02 |
1.05 |
| Model II : const*TBabs*zTBabs(pexrav+zgauss) | |||||
| Γ | 1.65 |
1.72 |
1.76 |
1.79 |
1.82 |
| NH(zTBabs) | – | – | – | – | 7.66 |
| Ecut | 125 |
185 |
110 |
193 |
> 175 |
| R | < 0.07 | < 0.11 | 0.29 |
0.19 |
< 0.23 |
| E | – | – | – | 6.48 |
– |
| EW | < 49 | < 43 | < 33 | < 63 | < 50 |
| Norm | 111 |
144 |
139 |
144 |
75 |
| χ2/d.o.f. | 569/599 | 647/631 | 552/549 | 509/574 | 446/398 |
| CFPMA/FPMB | 1.02 |
1.00 |
1.03 |
1.02 |
1.05 |
| Model III : const*TBabs*zTBabs(xillver) | |||||
| Γ | 1.65 |
1.72 |
1.70 |
1.77 |
1.82 |
| NH(zTBabs) | – | – | – | – | 7.56 |
| Ecut | 124 |
169 |
103 |
163 |
> 366 |
| R | < 0.10 | < 0.16 | 0.17 |
0.22 |
< 0.11 |
| Norm | 2.92 |
3.54 |
2.79 |
3.05 |
2.10 |
| χ2/d.o.f. | 569/599 | 647/631 | 556/549 | 510/576 | 447/398 |
| CFPMA/FPMB | 1.02 |
1.00 |
1.03 |
1.02 |
1.05 |
| Model IV : const*TBabs*zTBabs(xillverCP) | |||||
| Γ | 1.76 |
1.79 |
1.80 |
1.83 |
1.83 |
| NH(zTBabs) | – | – | – | – | 7.54 |
| kTe | 25 |
35 |
21 |
35 |
> 32 |
| R | < 0.06 | < 0.11 | < 0.25 | 0.17 |
< 0.09 |
| Norm | 2.68 |
3.26 |
2.66 |
2.85 |
1.71 |
| χ2/d.o.f. | 576/599 | 650/631 | 555/549 | 511/576 | 447/398 |
| CFPMA/FPMB | 1.02 |
1.00 |
1.03 |
1.02 |
1.05 |
| Flux | 1.07 |
1.22 |
1.08 |
1.09 |
0.47 |
Notes. Models are Model I: const*TBabs*zTBabs(zpo), Model II: const*TBabs*zTBabs(pexrav), Model III: const*TBabs*zTBabs(xillver), and Model IV: const*TBabs*zTBabs(xillverCP). The zTBabs component is added with all the models to fit the epoch E spectra. In epoch D, the width of the FeKα line was fixed to 0.1 keV. In the case where no line was detected, the upper limit on the equivalent width (EW) was calculated by fixing the line energy to 6.4 keV. The fluxes are in units of 10−10 erg cm−2 s−1 in the 4–60 keV band except in epoch E, where the flux was calculated in the 4–50 keV band. Columns and parameters have the same meaning as given for Table 2.
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