Table 5
Results of the spectral fits of the stacked RGS first-order spectrum of J1023.
| Element transition | Wavelength | Energy | Elab | |Δλ|∕λ | EQW | Δχ2 | Significance |
|---|---|---|---|---|---|---|---|
| (Å) | (eV) | (eV) | (eV) | (σ) | |||
| C V 1s-3p | 34.56 | 358.7 ± 0.5 (e) | 354.5 | 0.01 | 1.3 |
4.62 | 2.0 |
| C VI Lyα | 33.69 | 368.0 (e) |
367.5 | 0.001 | 1.4 |
9.84 | 3.3 |
| C VI Lyα | 33.25 | 372.9 ± 0.7 (a) | 367.5 | 0.01 | 1.7 |
7.53 | 3.1 |
| N VI (i) | 29.19 | 424.7 (e) |
426.3 | 0.004 | 1.6 |
11.24 | 3.4 |
| N VI (r) | 28.87 | 429.4 (e) |
430.7 | 0.003 | 1.2 |
6.01 | 2.7 |
| N VII Lyα | 24.56 | 504.8 (e) |
500.3 | 0.009 | 0.7 |
5.28 | 2.9 |
| O II 1s–2p | 23.38 | 530.4 (e) |
532.9 | 0.005 | 1.9 |
2.69 | 2.1 |
| O IV 1s–2p | 22.89 | 541.7 (e) |
543.06 | 0.003 | 1.6 |
4.84 | 2.3 |
| O V 1s–2p | 22.38 | 554.0 (e) |
552.29 | 0.003 | 1.2 |
7.60 | 2.7 |
| O VII 1s–2p | 21.57 | 574.7 (a) |
573.95 | 0.001 | 0.8 |
1.9 | 1.9 |
| Fe XX | 13.04 | 950.5 (a) |
949.3 | 0.001 | 4.4 |
16.95 | 3.9 |
| Fe XXIV | 10.56 | 1173.8 (a) |
1167.6 | 0.005 | 4.1 |
21.52 | 4.6 |
| Mg VII 1s–2p | 9.60 | 1291.0 ± 4.1 (e) | 1291.6 | 0.0005 | 3.2 |
10.44 | 2.8 |
| Mg XI (r) | 9.07 | 1366.7 (a) |
1357 | 0.007 | 2.9 |
5.05 | 2.3 |
Notes. Letters in parentheses indicate whether the narrow features are detected in emission (e) or absorption (a). EQW denotes the equivalent width of the Gaussian feature. Errors are reported at the 90 percent confidence level for a single parameter of interest. Δ χ2 indicates the improvement in the overall fit when adding the Gaussian component to the model.
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