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Table 1.
Neutral and ionized absorption and emission iron line modeling results of the NICER data during the descent to the obscured phase.
| MJD: | 58555.7 | 58569.4 | 58583.0 | 58589.2 | 58596.6 | 58604.4 | 58608.5 | 58622.5 | 58623.0 | 58631.1 |
|---|---|---|---|---|---|---|---|---|---|---|
| Fe I Kα | ||||||||||
| Energy (keV) | – | – | – | 6.31 |
– | – | – | 6.400 ± 0.005 | 6.38 ± 0.01 | 6.411 ± 0.007 |
| EW (eV) | – | – | – | 14 |
– | – | – | 138 ± 8 | 48 ± 6 | 90 ± 7 |
| Fe XXV Kα | ||||||||||
| Energy (keV) | 6.70 ± 0.03 | 6.66 ± 0.01 | 6.65 ± 0.20 | 6.63 ± 0.01 | 6.63 ± 0.01 | 6.619 ± 0.008 | 6.59 ± 0.01 | 6.65 ± 0.01 | 6.64/6.70 | 6.67 ± 0.01 |
| EW (eV) | −23 ± 8 | −37 ± 6 | −33 ± 6 | −50 |
−87 |
−133 |
−87 |
46 ± 7 | 25 ± 15/−29 ± 14 | 154 ± 9 |
| σ (keV) | 0.01 | 0.01 | 0.01 | 0.01 | 0.07 |
0.10 ± 0.01 | 0.06 |
0.01 | 0.01/0.01 | 0.01 |
| N (1017 cm−2) | 2.6 | 4.3 | 3.8 | 5.8 | 10 | 16 | – | – | – | – |
| Fe XXVI Lyα | ||||||||||
| Energy (keV) | 6.97 ± 0.04 | 6.97 ± 0.02 | 6.95 ± 0.02 | 6.93 ± 0.02 | 6.97 ± 0.02 | 6.98 ± 0.02 | – | 7.00 |
6.98 |
6.98 ± 0.01 |
| EW (eV) | −17 ± 8 | −26 ± 6 | −27 ± 6 | −36 ± 6 | −32 ± 6 | −33 ± 6 | – | 119 |
57 ± 16 | 150 ± 12 |
| N (1017 cm−2) | 3.7 | 5.7 | 5.9 | 8.0 | 6.9 | 7.3 | – | – | – | – |
| Fe XXV Kβ | ||||||||||
| Energy (keV) | – | – | – | 7.84 ± 0.03 | 7.84 ± 0.02 | 7.83 ± 0.02 | 7.81 ± 0.02 | – | – | 7.82 |
| EW (eV) | – | – | – | −37 ± 9 | −43 ± 8 | −54 ± 11 | −55 ± 11 | – | – | 33 ± 12 |
| Fe XXVI Lyβ | ||||||||||
| Energy (keV) | – | – | – | 8.14 ± 0.04 | 8.23 ± 0.03 | 8.21 ± 0.02 | 8.21 ± 0.04 | – | – | 8.27 |
| EW (eV) | – | – | – | −28 ± 10 | −43 ± 9 | −52 |
−31 ± 14 | – | – | 31 ± 14 |
Notes. The corresponding X-ray spectra and models are plotted in Fig. 8. The line widths of all lines except in a few cases for Fe XXV Kα line are below detector resolution (∼0.01 keV).
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