Table 1.
Average values and standard deviations of the imaging parameters estimated by the three considered global search techniques for the reconstruction of the synthetic configurations in the first column of Fig. 2.
| 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) | |||
| C1 | Ground truth | 5000.0 | 8.0 | 0.0 | 0.0 | 5000.0 | 8.0 | 30.0 | 30.0 | |
| Simulated annealing | 4800 ± 600 | 9.0 ± 2.0 | −0.1 ± 0.6 | 0.1 ± 0.3 | 5000 ± 600 | 10.0 ± 3.0 | 30.3 ± 0.5 | 30.0 ± 0.4 | ||
| Evolutionary algorithm | 4700 ± 400 | 8.0 ± 1.0 | 0.0 ± 0.4 | 0.1 ± 0.2 | 5000 ± 400 | 9.0 ± 1.0 | 30.1 ± 0.4 | 29.9 ± 0.3 | ||
| PSO | 4800 ± 100 | 8.5 ± 0.6 | 0.2 ± 0.2 | 0.1 ± 0.3 | 4800 ± 100 | 8.2 ± 0.7 | 30.1 ± 0.2 | 29.9 ± 0.3 | ||
| C2 | Ground truth | 5000.0 | 8.0 | −15.0 | −15.0 | 3000.0 | 8.0 | 15.0 | 15.0 | |
| Simulated annealing | 4700 ± 600 | 8.0 ± 2.0 | −15.4 ± 0.5 | −15.1 ± 0.2 | 3000 ± 600 | 13.0 ± 5.0 | 15.0 ± 1.0 | 15.0 ± 1.0 | ||
| Evolutionary algorithm | 4900 ± 300 | 8.6 ± 0.7 | −15.0 ± 0.3 | −15.0 ± 0.2 | 3000 ± 200 | 9.0 ± 1.0 | 14.9 ± 0.4 | 14.0 ± 0.3 | ||
| PSO | 4900 ± 100 | 8.5 ± 0.4 | −15.0 ± 0.2 | −15.0 ± 0.2 | 2770 ± 90 | 8.5 ± 0.9 | 14.9 ± 0.4 | 14.9 ± 0.3 | ||
| C3 | Ground truth | 5000.0 | 8.0 | −15.0 | 0.0 | 5000.0 | 8.0 | 15.0 | 0.0 | |
| Simulated annealing | 4800 ± 700 | 9.0 ± 3.0 | −15.1 ± 0.7 | −0.1 ± 0.5 | 5000 ± 900 | 10.0 ± 3.0 | 15.0 ± 0.6 | 0.2 ± 0.4 | ||
| Evolutionary algorithm | 4800 ± 500 | 8.0 ± 2.0 | −15.0 ± 0.4 | 0.1 ± 0.3 | 5000 ± 600 | 9.0 ± 2.0 | 15.0 ± 0.4 | 0.0 ± 0.2 | ||
| PSO | 4900 ± 100 | 8.5 ± 0.6 | −14.9 ± 0.2 | 0.1 ± 0.3 | 4770 ± 90 | 8.3 ± 0.4 | 15.1 ± 0.2 | 0.0 ± 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 | ||
| Simulated annealing | 64 500 ± 500 | 21.3 ± 0.4 | 7.0 ± 0.8 | −0.2 ± 0.4 | 20.5 ± 0.1 | 0.0 ± 0.1 | 56.0 ± 10.0 | |||
| Evolutionary algorithm | 78 100 ± 700 | 27.0 ± 2.0 | 8.9 ± 0.6 | 0.1 ± 0.4 | 20.0 ± 0.1 | 0.0 ± 0.1 | 69.0 ± 2.0 | |||
| PSO | 78 300 ± 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 | ||
| Simulated annealing | 67 000 ± 1000 | 17.3 ± 0.3 | 9.9 ± 0.5 | 45.0 ± 1.0 | 20.4 ± 0.1 | 20.3 ± 0.1 | 50.0 ± 20.0 | |||
| Evolutionary algorithm | 78 400 ± 500 | 20.0 ± 0.3 | 12.1 ± 0.2 | 44.0 ± 1.0 | 20.1 ± 0.1 | 20.0 ± 0.1 | 99.0 ± 6.0 | |||
| 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 | ||
| Simulated annealing | 8800 ± 100 | 22.0 ± 1.0 | 10.8 ± 0.8 | 45.0 ± 2.0 | 15.2 ± 0.2 | 15.0 ± 0.2 | 102.0 ± 8.0 | |||
| Evolutionary algorithm | 8800 ± 400 | 21.0 ± 2.0 | 10.0 ± 2.0 | 45.0 ± 2.0 | 15.3 ± 0.4 | 15.0 ± 0.4 | 100.0 ± 20.0 | |||
| 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 algorithms have been applied to 25 random realizations of the STIX synthetic visibility sets.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.