Table 1
Xspec model used in this study.
| Component | Parameter | Units | Status | Value | Prior | Median | STD |
|---|---|---|---|---|---|---|---|
| TBabs | NH | 1022 cm−2 | Thawed | – | 𝒢(0.6, 0.1) | 0.70 | 0.06 |
| gsmooth | Sig6 keV | keV | Thawed | – | 𝓛𝓤(6e–3, 0.15) | 0.08 | 0.02 |
| Index | Frozen | 1 | – | – | – | ||
| kT | keV | Thawed | – | 𝓛𝓤(0.4, 10) | 1.3 | 0.7 | |
| H, He, C, N, O, Ne | Frozen | 1 | – | – | – | ||
| Mg | Thawed | – | 𝓛𝓤(0.1, 500) | 49 | 13 | ||
| Si | Frozen | 1000 | – | – | – | ||
| S | Thawed | – | 𝓛𝓤(50, 9999) | 762 | 82 | ||
| VNEI 1 | Ar | Thawed | – | 𝓛𝓤(50, 9999) | 772 | 182 | |
| Ca | Thawed | – | 𝓛𝓤(50, 9999) | 1754 | 690 | ||
| Fe, Ni | Frozen | 1 | – | – | – | ||
| Tau | cm−3 s | Thawed | – | 𝓛𝓤(5e9, 5e12) | 4.7e10 | 1.3e10 | |
| Redshift z1 | Thawed | – | 𝓤(−6e–2, 6e–2) | 0 | 5e-3 | ||
| normalisation | cm−5 | Thawed | – | 𝓛𝓤(1e–7, 1e–3) | |||
| kT | keV | Thawed | – | 𝒢(10, 2) | 9.0 | 1.5 | |
| H, He, C, N | Frozen | 1 | – | – | – | ||
| O, Ne, Mg, Si, S, Ar, Ca | Frozen | 1 | – | – | – | ||
| VNEI 2 | Fe, Ni | Frozen | 1000 | – | – | – | |
| Tau | cm−3 s | Thawed | – | 𝓛𝓤(5e8, 5e11) | 9.0e9 | 1.9e9 | |
| Redshift z2 | Linked to z1 | – | – | – | – | ||
| Normalisation | cm−5 | Thawed | – | 𝓛𝓤(1e–8, 1e–4) | |||
| zgauss G1 | LineE | keV | Frozen | 1.24 | – | – | – |
| Normalisation | ph cm−2 s−1 | Thawed | – | 𝓛𝓤(1e–7, 1e–3) | |||
| zgauss G2 | LineE | keV | Frozen | 0.72 | – | – | – |
| Normalisation | ph cm−2 s−1 | Thawed | – | 𝓛𝓤(1e–8, 1e–3) | |||
| zgauss G3 | LineE | keV | Frozen | 0.654 | – | – | – |
| Normalisation | ph cm−2 s−1 | Thawed | – | 𝓛𝓤(1e–8, 1e–3) | |||
| zgauss G4 | LineE | keV | Frozen | 0.570 | – | – | – |
| Normalisation | ph cm−2 s−1 | Thawed | – | 𝓛𝓤(1e–8, 1e–3) | |||
| power law | PhoIndex | Thawed | – | G(2.6, 0.5) | 2.5 | 0.2 | |
| Normalisation at 1 keV | ph cm−2s−1 keV−1 | Thawed | – | 𝓛𝓤(1e–7, 2e–3) | |||
Notes. This model consists of two thermal non-equilibrium ionisation collisional components and a power law. The first represents the IMEs (VNEI 1) and the latter the iron-rich plasma (VNEI 2). Four Gaussians are added to account for line features in the residuals. Their sigma is frozen to 0 and the redshift is linked to that of the ejecta VNEI (z1). The status of the parameter during the fit is indicated and its value if it is frozen. If the parameter is free to vary, we indicate the type of prior: logarithmic uniform (𝓛𝓤), linearly uniform (𝓤) or Gaussian (𝒢). The last two columns are the median and standard deviation (STD) of each parameter over all regions.
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