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http://hdl.handle.net/20.500.12386/31765
Titolo: | Redundant-Baseline Calibration of the Hydrogen Epoch of Reionization Array | Autori: | Joshua S. Dillon Max Lee Zaki S. Ali Aaron R. Parsons Naomi Orosz Chuneeta Devi Nunhokee Paul La Plante Adam P. Beardsley Nicholas S. Kern Zara Abdurashidova James E. Aguirre Paul Alexander Yanga Balfour BERNARDI, GIANNI Tashalee S. Billings Judd D. Bowman Richard F. Bradley Phil Bull Jacob Burba Steve Carey Chris L. Carilli Carina Cheng David R. DeBoer Matt Dexter Eloy de Lera Acedo John Ely Aaron Ewall-Wice Nicolas Fagnoni Randall Fritz Steven R. Furlanetto Kingsley Gale-Sides Brian Glendenning Deepthi Gorthi Bradley Greig Jasper Grobbelaar Ziyaad Halday Bryna J. Hazelton Jacqueline N. Hewitt Jack Hickish Daniel C. Jacobs Austin Julius Joshua Kerrigan Piyanat Kittiwisit Saul A. Kohn Matthew Kolopanis Adam Lanman Telalo Lekalake David Lewis Adrian Liu Yin-Zhe Ma David MacMahon Lourence Malan Cresshim Malgas Matthys Maree Zachary E. Martinot Eunice Matsetela Andrei Mesinger Mathakane Molewa Miguel F. Morales Tshegofalang Mosiane Steven Murray Abraham R. Neben Bojan Nikolic Robert Pascua Nipanjana Patra Samantha Pieterse Jonathan C. Pober Nima Razavi-Ghods Jon Ringuette James Robnett Kathryn Rosie Mario G. Santos Peter Sims Craig Smith Angelo Syce Max Tegmark Nithyanandan Thyagarajan Peter K. G. Williams Haoxuan Zheng |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 499 | Fascicolo: | 4 | Da pagina:: | 5840 | Abstract: | In 21 cm cosmology, precision calibration is key to the separation of the neutral hydrogen signal from very bright but spectrally-smooth astrophysical foregrounds. The Hydrogen Epoch of Reionization Array (HERA), an interferometer specialized for 21 cm cosmology and now under construction in South Africa, was designed to be largely calibrated using the self-consistency of repeated measurements of the same interferometric modes. This technique, known as "redundant-baseline calibration" resolves most of the internal degrees of freedom in the calibration problem. It assumes, however, on antenna elements with identical primary beams placed precisely on a redundant grid. In this work, we review the detailed implementation of the algorithms enabling redundant-baseline calibration and report results with HERA data. We quantify the effects of real-world non-redundancy and how they compare to the idealized scenario in which redundant measurements differ only in their noise realizations. Finally, we study how non-redundancy can produce spurious temporal structure in our calibration solutions--both in data and in simulations--and present strategies for mitigating that structure. | URI: | http://hdl.handle.net/20.500.12386/31765 | URL: | https://academic.oup.com/mnras/article/499/4/5840/5917098 http://arxiv.org/abs/2003.08399v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa3001 | Bibcode ADS: | 2020MNRAS.499.5840D | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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