Table 4.
Average values and standard deviations of the imaging parameters estimated by VIS_FWDFIT and VIS_FWDFIT_PSO for the reconstruction of the six synthetic configurations in the first row of Figs. 4 and 5.
| First source |
Second source |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Flux | FWHM | x | y | Flux | FWHM | x | y | |||
| (counts s−1 keV−1 cm−2) | (arcsec) | (arcsec) | (arcsec) | (counts s−1 keV−1 cm−2) | (arcsec) | (arcsec) | (arcsec) | |||
| Simulated | 5000.0 | 8.0 | 0.0 | 0.0 | 5000.0 | 8.0 | 30.0 | 30.0 | ||
| C1 | VIS_FWDFIT | 4900 ± 500 | 8.0 ± 2.0 | −1.0 ± 0.4 | −0.2 ± 0.6 | 5100 ± 500 | 20.0 ± 10.0 | 35.0 ± 5.0 | 35.0 ± 5.0 | |
| VIS_FWDFIT_PSO | 4780 ± 90 | 8.5 ± 0.7 | −0.1 ± 0.2 | 0.1 ± 0.2 | 4840 ± 60 | 8.7 ± 0.4 | 30.1 ± 0.2 | 30.1 ± 0.2 | ||
| Simulated | 5000.0 | 8.0 | −15.0 | −15.0 | 3000.0 | 8.0 | 15.0 | 15.0 | ||
| C2 | VIS_FWDFIT | 4000 ± 3000 | 40.0 ± 10.0 | −5.0 ± 3.0 | −5.0 ± 3.0 | 4000 ± 2000 | 40.0 ± 10.0 | −2.0 ± 5.0 | −1.0 ± 5.0 | |
| VIS_FWDFIT_PSO | 4880 ± 80 | 8.4 ± 0.6 | −14.9 ± 0.2 | −15.0 ± 0.2 | 2840 ± 90 | 8.3 ± 0.9 | 14.9 ± 0.5 | 14.9 ± 0.4 | ||
| Simulated | 5000.0 | 8.0 | −15.0 | 0.0 | 5000.0 | 8.0 | 15.0 | 0.0 | ||
| C3 | VIS_FWDFIT | 5100 ± 300 | 10.0 ± 1.0 | −14.9 ± 0.4 | −0.1 ± 0.4 | 4700 ± 200 | 12.0 ± 4.0 | 18.0 ± 4.0 | 0.1 ± 0.3 | |
| VIS_FWDFIT_PSO | 4800 ± 200 | 8.5 ± 0.6 | −15.1 ± 0.2 | 0.1 ± 0.3 | 4800 ± 100 | 8.4 ± 0.6 | 15.0 ± 0.3 | −0.1 ± 0.2 | ||
| Loop | ||||||||||
| Flux | FWHM max | FWHM min | α | x | y | Loop angle | ||||
| (counts s−1 keV−1 cm−2) | (arcsec) | (arcsec) | (deg) | (arcsec) | (arcsec) | (deg) | ||||
| C4 | Ground truth | 80 000.0 | 22.5 | 9.0 | 0.0 | 20.0 | 0.0 | 70.0 | ||
| VIS_FWDFIT | 78300 ± 200 | 24.5 ± 0.9 | 10.0 ± 0.7 | 0.1 ± 0.6 | 20.0 ± 0.2 | 0.0 ± 0.3 | 69.0 ± 2.0 | |||
| VIS_FWDFIT_PSO | 78300 ± 200 | 24.5 ± 0.9 | 10.0 ± 0.7 | 0.1 ± 0.6 | 20.0 ± 0.2 | 0.0 ± 0.3 | 69.0 ± 2.0 | |||
| C5 | Ground truth | 80 000.0 | 22.0 | 14.0 | 45.0 | 20.0 | 20.0 | 105.0 | ||
| VIS_FWDFIT | 78 400 ± 200 | 19.1 ± 0.3 | 12.3 ± 0.2 | 44.0 ± 1.0 | 20.1 ± 0.1 | 20.0 ± 0.1 | 101.0 ± 7.0 | |||
| VIS_FWDFIT_PSO | 78 400 ± 200 | 19.1 ± 0.3 | 12.3 ± 0.2 | 44.0 ± 1.0 | 20.1 ± 0.1 | 20.0 ± 0.1 | 101.0 ± 7.0 | |||
| C6 | Ground truth | 9000.0 | 22.0 | 12.0 | 45.0 | 15.0 | 15.0 | 105.0 | ||
| VIS_FWDFIT | 8800 ± 100 | 20.8 ± 0.6 | 11.0 ± 2.0 | 45.0 ± 2.0 | 15.1 ± 0.2 | 15.0 ± 0.2 | 106.0 ± 6.0 | |||
| VIS_FWDFIT_PSO | 8800 ± 100 | 21.1 ± 0.6 | 11.5 ± 0.5 | 45.0 ± 2.0 | 15.2 ± 0.2 | 15.0 ± 0.2 | 105.0 ± 6.0 | |||
Notes. For each configuration, the two algorithms have been applied to 25 random realizations of the STIX synthetic visibilities.
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