Table 3.
Parameters of the best-fit spectral models to the observed XMM-Newton EPIC spectra of M33 X-7.
| Model parameter | Best-fit values for ϕ ≈ 0.47 | Best-fit values for ϕ ≈ 0.33 |
|---|---|---|
| tbabs(apec+diskpbb) | ||
| NH [1021 cm−2] | 2.3 ± 0.3 | 2.3 ± 0.3 |
| kT [keV] | 0.3 ± 0.1 | 0.3 ± 0.1 |
| EM [1059 cm−3] | 5.4 ± 3.8 | 2.9 ± 2.8 |
| Tin [keV] | 1.17 ± 0.07 | 1.25 ± 0.08 |
| Parameter p: T(r)∝r−p | 0.54 ± 0.03 | 0.53 ± 0.02 |
| norm | 0.014 ± 0.006 | 0.007 ± 0.003 |
| Reduced χ2 | With 201 d.o.f. 1.0 | With 217 d.o.f. 1.0 |
| Model FX [erg cm−2 s−1] | 1.1 × 10−12 | 9.7 × 10−13 |
| Luminosity LX [erg s−1] | 1.7 × 1038 | 1.5 × 1037 |
| tbabs*brems | ||
| NH [1021 cm−2] | 2.1 ± 0.1 | 1.9 ± 0.1 |
| kT [keV] | 2.34 ± 0.08 | 2.47 ± 0.09 |
| EM [1060 cm−3] | 4.5 ± 0.1 | 3.6 ± 0.1 |
| Reduced χ2 | With 204 d.o.f. 1.1 | With 220 d.o.f. 1.05 |
| Model FX [erg cm−2 s−1] | 1.1 × 10−12 | 9.9 × 10−13 |
| Luminosity LX [erg s−1] | 1.7 × 1038 | 1.5 × 1038 |
Notes. Two models are fitted. The first one is the plasma apec model for the metallicity 0.5 Z⊙ combined with a diskpbb model and corrected for ISM absorption tbabs. The second one is the Bremsstrahlung (brems) model corrected for ISM absorption tbabs. Fluxes and luminosities are in the 0.2–12.0 keV band.
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