Patterns of primary beam non-redundancy in close-packed 21 cm array observations

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dc.contributor.authorChoudhuri, Samir
dc.contributor.authorBull, Philip
dc.contributor.authorGarsden, Hugh
dc.date.accessioned2022-10-14T07:45:57Z
dc.date.available2022-10-14T07:45:57Z
dc.date.issued2021
dc.description.abstractRadio interferometer arrays such as HERA consist of many close-packed dishes arranged in a regular pattern, giving rise to a large number of ‘redundant’ baselines with the same length and orientation. Since identical baselines should see an identical sky signal, this provides a way of finding a relative gain/bandpass calibration without needing an explicit sky model. In reality, there are many reasons why baselines will not be exactly identical, giving rise to a host of effects that spoil the redundancy of the array and induce spurious structure in the calibration solutions if not accounted for. In this paper, we seek to build an understanding of how differences in the primary beam response between antennas affect redundantly calibrated interferometric visibilities and their resulting frequency (delay-space) power spectra. We use simulations to study several generic types of primary beam variation, including differences in the width of the main lobe, the angular and frequency structure of the sidelobes, and the beam ellipticity and orientation.en_US
dc.identifier.citationChoudhuri, S. et al. (2021). Patterns of primary beam non-redundancy in close-packed 21 cm array observations. Monthly Notices of the Royal Astronomical Society, 506(2), 2066–2088. https://doi.org/10.1093/mnras/stab1795en_US
dc.identifier.issn1365-2966
dc.identifier.urihttps://doi.org/10.1093/mnras/stab1795
dc.identifier.urihttp://hdl.handle.net/10566/8051
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectAstrophysicsen_US
dc.subjectAstronomyen_US
dc.subjectDark agesen_US
dc.subjectReionizationen_US
dc.subjectRadiationen_US
dc.subjectRadio interferometer arraysen_US
dc.titlePatterns of primary beam non-redundancy in close-packed 21 cm array observationsen_US
dc.typeArticleen_US

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