التفاصيل البيبلوغرافية
| العنوان: |
Redundant-baseline calibration of the hydrogen epoch of reionization array. |
| المؤلفون: |
Dillon, Joshua S, Lee, Max, Ali, Zaki S, Parsons, Aaron R, Orosz, Naomi, Nunhokee, Chuneeta Devi, La Plante, Paul, Beardsley, Adam P, Kern, Nicholas S, Abdurashidova, Zara, Aguirre, James E, Alexander, Paul, Balfour, Yanga, Bernardi, Gianni, Billings, Tashalee S, Bowman, Judd D, Bradley, Richard F, Bull, Phil, Burba, Jacob, Carey, Steve |
| المصدر: |
Monthly Notices of the Royal Astronomical Society; Dec2020, Vol. 499 Issue 4, p5840-5861, 22p |
| مصطلحات موضوعية: |
CALIBRATION, HYDROGEN, REDUNDANCY in engineering, DEGREES of freedom |
| مصطلحات جغرافية: |
SOUTH Africa |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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