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Fig. 4


Wide-field (8° × 8°) image of the target field before a) and after b) DD subtraction. The central frequency is 143 MHz, and the bandwidth is 1.9 MHz (SB 40–49). The image is 2100 × 2100 pixels of 18′′, baseline length was restricted to 10 kλ to ensure a good sampling of the PSF. A natural weighting was used and deconvolution with AWimager (implementing A-projection and W-projection) with 10 000 iterations and a CLEAN gain of 0.1. The angular resolution is ~2.5′. The r.m.s. and the S/N are, respectively, 37 mJy/Beam and 71 in the non-peeled image a) and ~27 mJy/Beam and 98 in the peeled image b). Sixty background sources have been automatically identified and subtracted in panel a) to obtain the image of panel b). Jupiter lies at the center of the field. The beam size and shape are displayed in the bottom left of each panel.

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