Table 4.
Best-fit values and 1σ errors of the RGS fits on the Centaurus core for our four different experiments.
| 2T | ||||||
|---|---|---|---|---|---|---|
| 0.8 arcmin | 3.0 arcmin | |||||
| orders 1+2 | order 1 | orders 1+2( * ) | order 1 | nH free (o1+2) | Xspec (o1+2) | |
| EM1/norm1 | 0.156 ± 0.005 | 0.157 ± 0.005 | 0.271 ± 0.012 | 0.277 ± 0.013 | 0.16 ± 0.005 | 0.133 ± 0.004 |
| EM2/norm2 | 2.92 ± 0.04 | 2.93 ± 0.04 | 6.93 ± 0.07 | 6.92 ± 0.07 | 2.94 ± 0.08 | 3.10 ± 0.04 |
| kT1 | 0.753 ± 0.012 | 0.752 ± 0.012 | 0.779 ± 0.014 | 0.768 ± 0.016 | 0.768 ± 0.013 | 0.805 ± 0.014 |
| kT2 | 1.612 ± 0.015 | 1.656 ± 0.019 | 1.646 ± 0.014 | 1.643 ± 0.017 | 1.628 ± 0.019 | 1.824 ± 0.021 |
| Fe | 0.90 ± 0.03 | 0.94 ± 0.03 | 0.818 ± 0.019 | 0.801 ± 0.021 | 0.90 ± 0.04 | 1.10 ± 0.04 |
| N/Fe | 2.6 ± 0.3 | 2.4 ± 0.3 | 2.6 ± 0.3 | 2.5 ± 0.3 | 1.7 ± 0.3 | 2.4 ± 0.3 |
| O/Fe | 0.72 ± 0.03 | 0.70 ± 0.04 | 0.73 ± 0.03 | 0.73 ± 0.03 | 0.61 ± 0.03 | 1.03 ± 0.03 |
| Ne/Fe | 0.67 ± 0.06 | 0.77 ± 0.08 | 0.71 ± 0.05 | 0.76 ± 0.08 | 0.69 ± 0.06 | 1.04 ± 0.08 |
| Mg/Fe | 0.63 ± 0.05 | 0.50 ± 0.07 | 0.46 ± 0.05 | 0.27 ± 0.06 | 0.65 ± 0.06 | 0.65 ± 0.05 |
| C-stat/d.o.f. | 1826/1302 | 883/570 | 2012/1302 | 930/570 | 1821/1301 | 7216/6551 |
Notes. The SPEX emission measures are given in units of 1071/m3 and the Xspec normalisations are given in units of 10−2/cm5. The temperatures kT1 and kT2 are given in keV. The Fe abundance and X/Fe ratios are given in solar units (Lodders et al. 2009). ( * ) The fit extracted over 3′ cross-dispersion aperture and including the two orders constitutes our baseline RGS model.
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