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Table 1.
Simplest spectral model fits to the spectrum of the entire SNR in the 0.4–3 keV band.
| Model | kT | NH | τ | Normalization | χ2 (d.o.f.) |
|---|---|---|---|---|---|
| keV | cm−2 | s cm−3 | cm−6 pc | ||
| APEC | 0.12 ± 0.004 | (0.61 ± 0.03)×1022 | – | 0.95 ± 0.28 | 366 (318) |
| NEI | 0.14 ± 0.02 | (0.57 ± 0.07)×1022 | (2.1 ± 0.1)×1011 | 0.33 ± 0.28 | 331 (317) |
| NEI, fixed kT, NH | 1 | 0.25 × 1022 | (2.73 ± 0.15)×109 | (0.31 ± 0.07)×10−2 | 405 (319) |
Notes. The abundance is fixed to solar. We note that for the NEI model with free NH and kT, all of the parameters are highly correlated, leading to large uncertainties in their values.
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