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  Efficient wide-field radio interferometry response

Arras, P., Reinecke, M., Westermann, R., & Enßlin, T. A. (2021). Efficient wide-field radio interferometry response. Astronomy and Astrophysics, 646: A58. doi:10.1051/0004-6361/202039723.

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Arras, Philipp1, Author              
Reinecke, Martin2, Author              
Westermann, Rüdiger, Author
Enßlin, Torsten A.1, Author              
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
2Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: Radio interferometers do not measure the sky brightness distribution directly, but measure a modified Fourier transform of it. Imaging algorithms therefore need a computational representation of the linear measurement operator and its adjoint, regardless of the specific chosen imaging algorithm. In this paper, we present a C++ implementation of the radio interferometric measurement operator for wide-field measurements that is based on so-called improved w-stacking. It can provide high accuracy (down to ≈10−12), is based on a new gridding kernel that allows smaller kernel support for given accuracy, dynamically chooses kernel, kernel support, and oversampling factor for maximum performance, uses piece-wise polynomial approximation for cheap evaluations of the gridding kernel, treats the visibilities in cache-friendly order, uses explicit vectorisation if available, and comes with a parallelisation scheme that scales well also in the adjoint direction (which is a problem for many previous implementations). The implementation has a small memory footprint in the sense that temporary internal data structures are much smaller than the respective input and output data, allowing in-memory processing of data sets that needed to be read from disk or distributed across several compute nodes before.

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 Dates: 2021-02-05
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/202039723
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 646 Sequence Number: A58 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1