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http://hdl.handle.net/20.500.12386/35128
Title: | Impact of instrument and data characteristics in the interferometric reconstruction of the 21 cm power spectrum | Authors: | Gorce, Adélie Ganjam, Samskruthi Liu, Adrian Murray, Steven G. Abdurashidova, Zara Adams, Tyrone Aguirre, James E. Alexander, Paul Ali, Zaki S. Baartman, Rushelle Balfour, Yanga Beardsley, Adam P. BERNARDI, Gianni Billings, Tashalee S. Bowman, Judd D. Bradley, Richard F. BULL, PHILIP Burba, Jacob Carey, Steven Carilli, Chris L. Cheng, Carina DeBoer, David R. Acedo, Eloy de Lera Dexter, Matt Dillon, Joshua S. Eksteen, Nico Ely, John Ewall-Wice, Aaron Fagnoni, Nicolas Fritz, Randall Furlanetto, Steven R. Gale-Sides, Kingsley Glendenning, Brian Gorthi, Deepthi Greig, Bradley Grobbelaar, Jasper Halday, Ziyaad Hazelton, Bryna J. Hewitt, Jacqueline N. Hickish, Jack Jacobs, Daniel C. Julius, Austin Kariseb, MacCalvin Kern, Nicholas S. Kerrigan, Joshua Kittiwisit, Piyanat Kohn, Saul A. Kolopanis, Matthew Lanman, Adam La Plante, Paul Loots, Anita MacMahon, David Harold Edward Malan, Lourence Malgas, Cresshim Malgas, Keith Marero, Bradley Martinot, Zachary E. Mesinger, Andrei Molewa, Mathakane Morales, Miguel F. Mosiane, Tshegofalang Neben, Abraham R. Nikolic, Bojan Nuwegeld, Hans Parsons, Aaron R. Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Razavi-Ghods, Nima Robnett, James Rosie, Kathryn Sims, Peter Swarts, Hilton Thyagarajan, Nithyanandan van Wyngaarden, Pieter Williams, Peter K. G. Zheng, Haoxuan |
Issue Date: | 2023 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 520 | Issue: | 1 | First Page: | 375 | Abstract: | Combining the visibilities measured by an interferometer to form a cosmological power spectrum is a complicated process. In a delay-based analysis, the mapping between instrumental and cosmological space is not a one-to-one relation. Instead, neighbouring modes contribute to the power measured at one point, with their respective contributions encoded in the window functions. To better understand the power measured by an interferometer, we assess the impact of instrument characteristics and analysis choices on these window functions. Focusing on the Hydrogen Epoch of Reionization Array (HERA) as a case study, we find that long-baseline observations correspond to enhanced low-k tails of the window functions, which facilitate foreground leakage, whilst an informed choice of bandwidth and frequency taper can reduce said tails. With simple test cases and realistic simulations, we show that, apart from tracing mode mixing, the window functions help accurately reconstruct the power spectrum estimator of simulated visibilities. The window functions depend strongly on the beam chromaticity and less on its spatial structure - a Gaussian approximation, ignoring side lobes, is sufficient. Finally, we investigate the potential of asymmetric window functions, down-weighting the contribution of low-k power to avoid foreground leakage. The window functions presented here correspond to the latest HERA upper limits for the full Phase I data. They allow an accurate reconstruction of the power spectrum measured by the instrument and will be used in future analyses to confront theoretical models and data directly in cylindrical space. | URI: | http://hdl.handle.net/20.500.12386/35128 | URL: | http://arxiv.org/abs/2210.03721v3 https://academic.oup.com/mnras/article/520/1/375/6986279 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stad090 | Bibcode ADS: | 2023MNRAS.520..375G | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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gorce23.pdf | PDF editoriale | 3.33 MB | Adobe PDF | View/Open |
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