Table 1.
Parameters of the best-fit spectral models to the observed XMM-Newton EPIC spectra of 3XMM J192758.7–413430.
| Model parameter | Best-fit value |
|---|---|
| tbabs(powerlaw+apec) | |
| NH (1021 cm−2) | 1.5 ± 0.3 |
| kT (keV) | 0.22 ± 0.02 |
| EM (1063 cm−3) | 2 ± 1 |
| Γ | 1.85 ± 0.06 |
| K (photon keV−1 cm−2 s−1 at 1 keV) | (5.5 ± 0.4) × 10−5 |
| reduced χ2 for 134 d.o.f. | 0.88 |
Unabsorbed  (erg cm−2 s−1) |
7 × 10−14 |
Unabsorbed  (erg cm−2 s−1) |
4 × 10−13 |
| tbabs(NH, 1)*powerlaw+tbabs(NH, 2)*apec | |
| NH,1 (1021 cm−2) | 0.6 ± 0.3 |
| kT (keV) | 0.24 ± 0.02 |
| EM (1063 cm−3) | 2 ± 1 |
| NH,1 (1021 cm−2) | 2.7 ± 1 |
| Γ | 1.96 ± 0.1 |
| K (photon keV−1 cm−2 s−1 at 1 keV) | (6.3 ± 0.7) × 10−5 |
| Reduced χ2 for 133 d.o.f. | 0.87 |
Unabsorbed  (erg cm−2 s−1) |
7 × 10−14 |
Unabsorbed  (erg cm−2 s−1) |
4 × 10−13 |
| Model FX (erg cm−2 s−1) | 3 × 10−13 |
| Luminosity LX (erg s−1) | 8 × 1040 |
Notes.Chandra observations (see Sect. 2.2) show that the dominant contribution to the 3XMM J192758.7–413430 X-ray light is provided by the IMBH candidate ESO 338-4 X-1. The fitted models are the thermal plasma apec model for the metallicity 0.2 Z⊙ combined with a power law with the photon index of power law Γ, and corrected for ISM absorption tbabs. Fluxes and luminosity are in the 0.2–12.0 keV band, and fluxes are listed for the individual model components as well as for the full model.
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