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Fig. 1.


Map of the W0855 field obtained in this analysis. The expected location of the source is indicated with a magenta ellipse of the shape of the synthesised beam. The bright source to the east is the background quasar 3C 209 with a flux of ca. 20 mJy, i.e. a factor of 2740 brighter than the sensitivity of 7.3 μJy that is achieved in the vicinity of W0855. To give an impression of the homogeneity of the noise, the brightness scaling in this high-dynamic-range image was set to strongly overexpose the quasar, which therefore appears more extended than the beam. The beam size is shown again as an ellipse in the lower left corner.

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