Open Access

Fig. 10.


S/N maps computed with the PACO, TLOCI, KLIP and LLSG algorithms. For TLOCI and KLIP, an unsharp filtering applied to S/N maps as post-processing is also considered. For LLSG, the resulting signed S/N is multiplied by a factor of 25 to fall within a comparable range than the other methods. For this latest algorithm, detection is in addition performed by discarding a centered circular area of 1 arcsec in radius. The first 32 detections are marked on each S/N map using square patterns. The 60 first detections are plotted as bar charts below each S/N map, ordered by decreasing S/N values, with true detections in pink (true background sources) or blue (injected fake sources), and false detections in red. Circles indicate the location of the real and injected faint point sources. PACO is the only algorithm capable of detecting correctly all sources without any false detection.

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