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http://hdl.handle.net/20.500.12386/31766
Titolo: | Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum | Autori: | Kern, Nicholas S. Dillon, Joshua S. Parsons, Aaron R. Carilli, Christopher L. BERNARDI, GIANNI Abdurashidova, Zara Aguirre, James E. Alexander, Paul Ali, Zaki S. Balfour, Yanga Beardsley, Adam P. Billings, Tashalee S. Bowman, Judd D. Bradley, Richard F. BULL, PHILIP Burba, Jacob Carey, Steven Cheng, Carina DeBoer, David R. Dexter, Matt de Lera Acedo, Eloy Ely, John Ewall-Wice, Aaron Fagnoni, Nicolas Fritz, Randall Furlanetto, Steve 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 Kerrigan, Joshua Kittiwisit, Piyanat Kohn, Saul A. Kolopanis, Matthew Lanman, Adam La Plante, Paul Lekalake, Telalo Liu, Adrian MacMahon, David Malan, Lourence Malgas, Cresshim Maree, Matthys Martinot, Zachary E. Matsetela, Eunice Mesinger, Andrei Molewa, Mathakane Morales, Miguel F. Mosiane, Tshegofalang Murray, Steven G. Neben, Abraham R. Nikolic, Bojan Nunhokee, Chuneeta D. Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Razavi-Ghods, Nima Ringuette, Jon Robnett, James Rosie, Kathryn Sims, Peter Smith, Craig Syce, Angelo Thyagarajan, Nithyanandan Williams, Peter K. G. Zheng, Haoxuan |
Data pubblicazione: | 2020 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 890 | Fascicolo: | 2 | Da pagina:: | 122 | Abstract: | We discuss absolute calibration strategies for Phase I of the Hydrogen Epoch of Reionization Array (HERA), which aims to measure the cosmological 21 cm signal from the Epoch of Reionization. HERA is a drift-scan array with a 10° wide field of view, meaning bright, well-characterized point-source transits are scarce. This, combined with HERA's redundant sampling of the uv plane and the modest angular resolution of the Phase I instrument, make traditional sky-based and self-calibration techniques difficult to implement with high dynamic range. Nonetheless, in this work, we demonstrate calibration for HERA using point-source catalogs and electromagnetic simulations of its primary beam. We show that unmodeled diffuse flux and instrumental contaminants can corrupt the gain solutions and present a gain-smoothing approach for mitigating their impact on the 21 cm power spectrum. We also demonstrate a hybrid sky and redundant calibration scheme and compare it to pure sky-based calibration, showing only a marginal improvement to the gain solutions at intermediate delay scales. Our work suggests that the HERA Phase I system can be well calibrated for a foreground avoidance power spectrum estimator by applying direction-independent gains with a small set of degrees of freedom across the frequency and time axes. | URI: | http://hdl.handle.net/20.500.12386/31766 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab67bc | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab67bc | Bibcode ADS: | 2020ApJ...890..122K | Fulltext: | open |
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