Table 3
Best-fit parameters of the combined Swift spectra of M101 ULX-1 in the 0.3−7 keV energy range using the following four models†: phabs*power, phabs*bbody, phabs*(bbody+power), and phabs*bmc.
| Model | Parameter | Band-A | Band-B | Band-Ch | Band-Cs | Band-D |
|
|
||||||
| Power-law | Γpow | 6.2±0.2 | 3.6±0.3 | 1.9±0.2 | 2.0±0.2 | 1.4±0.2 |
N |
2.8±0.03 | 1.4±0.02 | 0.67±0.05 | 0.68±0.04 | 0.04±0.01 | |
| χ2 (d.o.f.) | 2.3 (18) | 2.15 (18) | 2.03 (18) | 2.02 (18) | 1.15 (18) | |
|
|
||||||
| Bbody | T BB | 65±2 | 70±3 | 85±3 | 84±5 | 94±4 |
|
5.2±0.5 | 4.5±0.3 | 2.7±0.6 | 2.8±0.5 | 1.5±0.4 | |
| χ2 (d.o.f.) | 1.14 (18) | 1.28 (18) | 1.94 (18) | 1.93 (18) | 3.03 (18) | |
|
|
||||||
| Bbody | T BB | 70±3 | 86±4 | 90±5 | 89±3 | 70±4 |
|
|
4.2±0.5 | 3.6±0.6 | 1.4±0.6 | 1.6±0.5 | 1.3±0.4 | |
| Power-law | Γpow | 2.2±0.1 | 2.1±0.4 | 1.4±0.1 | 1.5±0.1 | 3.4±0.3 |
|
0.64±0.01 | 0.57±0.03 | 0.36±0.09 | 0.38±0.07 | 1.3±0.4 | |
| χ2 (d.o.f.) | 1.23 (16) | 1.19 (16) | 1.23 (16) | 1.22 (16) | 1.27 (16) | |
|
|
||||||
| bmc | Γbmc | 2.5±0.3 | 2.1±0.2 | 1.6±0.1 | 1.7±0.1 | 1.4±0.1 |
| T s | 92±10 | 76±9 | 56±10 | 57±10 | 42±8 | |
| logA | –5.3±0.4 | –4.7±0.5 | –4.3±0.4 | –4.2±0.5 | –3.9±0.5 | |
| N bmc †† | 15.6±0.5 | 8.1±0.3 | 4.4±0.2 | 4.5±0.4 | 2.9±0.2 | |
| χ2 (d.o.f.) | 1.21 (16) | 0.97 (16) | 1.15 (16) | 1.14 (16) | 1.03 (16) | |
Notes.
The normalization parameters of Blackbody and bmc components are in units of 
erg s-1 kpc-2, where 
is the soft photon luminosity in units of 1035 erg s-1, d10 is the distance to the source in units of 10 kpc, and power-law component is in units of 10-4 keV-1 cm-2 s-1 at 1 keV. NH is the column density for the neutral absorber, 3 × 1021 cm-2 (see details in the text). TBB and Ts are the temperatures of the blackbody and seed photon components, respectively (in eV). Γpow and Γbmc are the indices of the power law and bmc, respectively.
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