Comparison between the well-calibrated image (i.e. the same image as Fig 7a) and antenna-based sensitivity-optimal weights. Units of both colour bars are Jansky. Panel a: well-calibrated, un-weighted restored image of the sky near the centre of the Extended Groth Strip. Used for comparison with the other images. Calibration solution intervals used were eight seconds, half the bandwidth. rms = 5.87 mJy beam−1. Panel b: image made using the same imaging parameters and corrected visibilities as Fig. 7b, with the application of antenna-based, sensitivity-optimal weighting. Solution interval of two minutes, half the bandwidth. rms = 6.69 mJy beam−1. We see that we recover a very similar image, despite the fact that the data used for the weighted image are averaged by a factor of 8compared to those used for the un-weighted image.
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