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Table 2.
Spectral model parameters for the five point sources and the diffuse emission in ESO 338-4.
| Model parameter | Best-fit value |
|---|---|
| Point sources | |
| ULX1: tbabsGal × tbabsint × (diskbb1 + diskbb2) | |
| NH, int (1022 cm−2) | 0.6 ± 0.3 |
| Tin, 1 (keV) | 1.7 ± 0.2 |
| Norm1 | (8 ± 3)×10−4 |
| Tin, 2 (keV) | 0.215 ± 0.009 |
| Norm2 | 30 ± 10 |
| ULX2: tbabsGal × tbabsint × diskpbb | |
| NH, int (1022 cm−2) | 0.1 ± 0.2 |
| Tin (keV) | 1.2 ± 0.1 |
| Norm | (7 ± 9)×10−3 |
| Γ | 1.0 ± 0.8 |
| ULX3: tbabsGal × tbabsint × powerlaw | |
| NH, int (1022 cm−2) | 0.7 ± 0.3 |
| Norm (photons keV−1 cm−2 s−1 at 1 keV) | (1.8 ± 0.8)×10−5 |
| Γ | 2.7 ± 0.3 |
| ULX4: tbabsGal × tbabsint × powerlaw | |
| NH, int (1022 cm−2) | 0.9 ± 0.6 |
| Norm (photons keV−1 cm−2 s−1 at 1 keV) | (1.0 ± 0.7)×10−5 |
| Γ | (2.5 ± 0.6) |
| ULX5: tbabsGal × tbabsint × powerlaw | |
| NH, int (1022 cm−2) | 2.1 ± 0.8 |
| Norm (photons keV−1 cm−2 s−1 at 1 keV) | (1.6 ± 1.2)×10−6 |
| Γ | 2.5 ± 0.6 |
| Diffuse sources | |
| Halo: tbabsGal × (APEC1 + APEC2) | |
| kT1 (keV) | 0.26 ± 0.02 |
| Norm1 (cm−3) | (2.7 ± 0.4)×10−5 |
| kT2 (keV) | 3.5 ± 0.3 |
| Norm2 (cm−3) | (6.1 ± 0.2)×10−5 |
| Central: tbabsGal × (APEC + Point-source contribution) | |
| kT (keV) | 0.262 ± 0.007 |
| Norm (cm−3) | (3.7 ± 0.1)×10−4 |
Notes. The results were derived by fitting the spectra of the Chandra and XMM-Newton observations of Appendix A. The Galactic foreground absorption tbabsGal is fixed at the value of NH = 5 × 1020 cm−2.
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