Table 1
Recovered XRT spectral resolution.
| Source | Mode | Epoch | Exposure | Line | FWHMobserved | FWHMcorrected | ΔR |
|
|
|||||||
| Cas A | PC | 2005/02 | 24.5 | Si | 108 ± 4 | – | – |
| S | 133 ± 6 | – | – | ||||
| Fe | 268 ± 8 | – | – | ||||
| Cas A | PC | 2007/09 | 38.1 | Si | 138 ± 7 | 114 ± 2 | 0.17 ± 0.05 |
| S | 200 ± 11 | 146 ± 6 | 0.27 ± 0.06 | ||||
| Fe | 318 ± 22 | 286 ± 21 | 0.10 ± 0.09 | ||||
| Cas A | PC | 2009/02 | 128.5 | Si | 154 ± 8 | 122 ± 2 | 0.21 ± 0.05 |
| S | 251 ± 18 | 163 ± 7 | 0.35 ± 0.08 | ||||
| Fe | 372 ± 25 | 321 ± 14 | 0.14 ± 0.08 | ||||
| Tycho | PC | 2009/10 | 75.1 | Si | 179 ± 8 | 132 ± 3 | 0.26 ± 0.05 |
| S | 267 ± 14 | 182 ± 8 | 0.32 ± 0.06 | ||||
| Fe | 381 ± 45 | 299 ± 31 | 0.21 ± 0.14 | ||||
| Tycho | PC | 2010/03 | 73.6 | Si | 177 ± 7 | 138 ± 3 | 0.22 ± 0.04 |
| S | 256 ± 10 | 184 ± 8 | 0.28 ± 0.05 | ||||
| Fe | 381 ± 39 | 307 ± 32 | 0.19 ± 0.13 | ||||
| Tycho | PC | 2010/10 | 71.5 | Si | 192 ± 7 | 139 ± 7 | 0.28 ± 0.05 |
| S | 269 ± 11 | 192 ± 11 | 0.29 ± 0.06 | ||||
| Fe | 387 ± 34 | 304 ± 27 | 0.21 ± 0.11 | ||||
| Cas A | WT | 2005/02 | 18.7 | Si | 101 ± 3 | – | – |
| S | 128 ± 6 | – | – | ||||
| Fe | 263 ± 8 | – | – | ||||
| Cas A | WT | 2007/10 | 37.7 | Si | 159 ± 13 | 106 ± 3 | 0.33 ± 0.09 |
| S | 244 ± 15 | 138 ± 7 | 0.43 ± 0.07 | ||||
| Fe | 383 ± 16 | 304 ± 15 | 0.21 ± 0.06 | ||||
| Cas A | WT | 2008/07 | 49.2 | Si | 161 ± 14 | 113 ± 4 | 0.30 ± 0.09 |
| S | 274 ± 17 | 154 ± 9 | 0.44 ± 0.08 | ||||
| Fe | 393 ± 22 | 325 ± 17 | 0.17 ± 0.07 | ||||
| Cas A | WT | 2009/10 | 27.4 | Si | 177 ± 16 | 120 ± 3 | 0.32 ± 0.10 |
| Tycho | WT | 2009/11 | 24.2 | Si | 196 ± 15 | 136 ± 7 | 0.31 ± 0.09 |
| Tycho | WT | 2010/10 | 41.9 | Si | 219 ± 12 | 148 ± 5 | 0.32 ± 0.06 |
Notes. XRT instrumental full width half maximum (FWHM) ineV of the silicon, sulphur and iron Kα lines in the observed and the corrected spectra of each calibration epoch (specified as YYYY/MM). The total exposure time of the observations used for the trap analysis for each epoch is reported in kiloseconds (ks). The FWHM values at sulphur and iron are only reported when enough counts in the lines allowed a reliable fit. The Cas A lines are at energies ESi = 1.863 keV, ES = 2.456 keV, EFe = 6.626 keV, while for Tycho ESi = 1.856 keV, ES = 2.450 keV, EFe = 6.430 keV, as derived from our fits to XMM spectra; the differences in the line energies originate from the dynamics of the expanding SNR shells. The last column quantifies the improvement in the energy resolution ΔR defined as 
, where 
.
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