Apertif (APERture Tile In Focus) is a phased array feed (PAF) system for the Westerbork synthesis radio telescope (WSRT) designed for performing wide field surveys of the northern sky (van Cappellen et al. 2022). During its operations in 2019 – 2022, the Apertif surveys covered about 2300 square degrees (Hess et al. in prep). The first imaging data release took place in 2019 and is described in Adams et al. (2022).
We have developed and applied a new procedure which includes both direction-independent (DI), described in Adebahr et al. 2022, and direction-dependent (DD) self-calibration to process Apertif data. The DD processing is based on the LOFAR Default Preprocessing Pipeline (DPPP/DP3; van Diepen et al. 2018) and the wsclean imaging package (Offringa et al. 2014).
With this pipeline we aim to produce Apertif 1.4 GHz mosaic images of several deep fields observed by LOFAR: Bootes, Elais-North and Lockman Hole. A detailed description of the data processing can be found in Kutkin et al. (2023)
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