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The quality of the images was validated according to the procedure described by Adams et al. 2022. The direction-dependent calibration allowed us to achieve a significant improvement of the quality of the individual images compared to the automatic pipeline without DD-calibration. This is illustrated in the Figure below.

Captioned Item
anchor9DU1I
nameFigure 2. Data quality DI and DD images
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nameapercal_vs_ddcal.pdf
height150

This is quantified by the The fraction of compound-beam images that pass the Apertif quality validation , which increased from 40 % using the default pipeline to 98 % with the new pipeline.

The completeness and reliability of the corresponding catalogs are estimated as described by Kutkin et al. (2022, 2023). The former was found to be 0.3 mJy while the false-detection number does not exceed 1.5%.