Table 2
Fit results on line emission.
| Expected | Line energy | (keV) | Δ χ2 | Intensitya | EW | (eV) | |||
| Observation | (keV) | Mar. 2006 | Sep. 2010 | Mar. 2006 | Sep. 2010 | Mar. 2006 | Sep. 2010 | Mar. 2006 | Sep. 2010 |
| (d.o.f. = 205) | (d.o.f. = 206) | ||||||||
|
|
|||||||||
| O Heα | 0.568 | 0.568(fixed) | 0.568(fixed) | – | – | 0.09(fixed) | 0.09(fixed) | 3.2(2) | 1.3(2) |
| O Lyα | 0.653 | 0.661(8) | 0.66(2) | 59 | 5.4b | 3.0 |
4(4) | 13(4) | 7(3) |
| Ne Heαc | 0.914 | 0.930(8) | 0.929(8) | 105 | 119 | 1.3(3) | 7(1) | 8(1) | 14(1) |
| Ne Lyα | 1.021 | 1.025(3) | 1.031(2) | 878 | 1699 | 3.3(2) | 24(1) | 22.6(2) | 50.9(8) |
| Ne Heβc | 1.084 | 1.084(fixed) | 1.13(3) | – | 39 | 0.2(fixed) | 3(1) | 3.7(2) | 6(2) |
| Ne Lyβ | 1.210 | 1.210(fixed) | 1.25(1) | 6 | 96 | 0.2(fixed) | 2(1) | 1.8(2) | 9(4) |
| Mg Heα | 1.34 | 1.32(2) | 1.38(2) | 36 | 31 | 0.4(1) | 1.8 |
4(1) | 5(1) |
| Ne Recombod | 1.362 | 1.48(2) | 1.52(2) | 137 | 154 | 0.9(2) | 5(1) | 11.1(3) | 15(5) |
| Fe K-fluor. linee | 6.4 | 6.5(2) | 6.78(7) | 59 | 30 | 0.8 |
1.3(5) | 42.2(3) | 33(1) |
Notes. The widths of the low-energy lines were fixed to the ASCA values (10 eV for all but the 1.362 keV line with 57 eV).
We note that, for the 2010 observation, the Δ χ2 for this line is not well computed due to the spectral model not being able to adequately fit this line (see Fig. 2, right panel).
The abundances of the lines at 0.914 and 1.084 keV can also be consistent with a blend of several L-shell iron line emission (see Angelini et al. 1995).
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