Temperature (kT ), metallicity (Z) and absorbing column density (N H ) obtained from fitting the apec to the individual line spectra. The N H for the Fe K band spectrum was assumed to be 4 × 10 22 cm −2 , approximately the middle value obtained for the Ca spectrum, as the energy range of the data is insensitive to N H < 10 23 cm −2 .

Contexts in source publication

Context 1

... results are illustrated in Fig. 3. The metallicity remains compatible between the elements at 0.6 Z . The gas temperatures inferred from individual elements remain in a limited range of kT 0.9-1.8 keV with a moderately increasing trend as the selected energy range moves higher. The absorption also shows the same increasing trend. Both indicate spectral hardening ...

Context 2

... soft X-ray wind emission (Th1) is modelled by apec with kT = 1.2 keV. This component, which dominates in the soft X-ray band, should still have a significant contribution in continuum emission at energies around 4-5 keV. The assumed temperature (and also the adopted N H value) was that obtained for the S K band (Fig. 3). We believe this choice is adequate for the soft X-ray wind emission spectrum at energies of Ar K and Ca K emission and above 4 keV for the reason described in Sect. 3.2.1. The metallicity is assumed to be 1 Z for the following reasons. It has to be larger than 0.6 Z inferred from the soft Xray lines (Fig. 3) to compensate the extra ...

Context 3

... was that obtained for the S K band (Fig. 3). We believe this choice is adequate for the soft X-ray wind emission spectrum at energies of Ar K and Ca K emission and above 4 keV for the reason described in Sect. 3.2.1. The metallicity is assumed to be 1 Z for the following reasons. It has to be larger than 0.6 Z inferred from the soft Xray lines (Fig. 3) to compensate the extra continuum contribution of the IC component. With this temperature, the spectrum has high-ionisation Fe K emission including Fe xxv, centred at 6.63 keV (see Appendix A) and it should not overproduce the Fe xxv feature of the 'low' spectrum, in which the hot thermal emission (as described below) contribution is ...