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Paper: Apercal - The Apertif Imaging Survey Data Calibration and
Analysis Pipeline
Volume: 527, Astronomical Data Analysis Software and Systems XXIX
Page: 659
Authors: Schulz, R.; Adebahr, B.; Moss, V. A.; Adams, E. A. K.; de Blok, W. J. G.; Denes, H.; Dijkema, T. J.; Hess, K. M.; van Hulst, J. M. d.; Kutkin, A.; Lucero, D.; Morganti, R.; Oosterloo, T.; Team Apertif
Abstract: Apertif (APERture Tile In Focus) is an extensive upgrade to the 50–year–old Westerbork Synthesis Radio Telescope replacing the single–pixel feeds with novel phased–array feeds to dramatically increase the field of view and survey speed of the telescope. As a result Apertif creates 40 individual beams on the sky with 300MHz bandwidth and 24576 channels achieving an instantaneous sky coverage of 6 square degrees with a high frequency resolution. The primary goal of the Apertif Imaging Survey is to perform a large–area shallow survey (3500 square degrees) and a small–area deep survey (450 square degrees) of neutral atomic hydrogen (up to a redshift of 0.26), radio continuum emission and polarisation in order to investigate galaxy formation, AGN evolution and cluster environments. The scientific goals and instrumental features of Apertif yield a wealth of data (about 5TB per observation) that required the development of Apercal, a dedicated and automated data reduction and analysis pipeline. Apercal makes use of existing tools as well as new ones and parallelisation to improve its performance. Here, we will outline the functionality of Apercal and our quality assessment strategy to get science ready data products.
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