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http://hdl.handle.net/20.500.12386/32316
Titolo: | Effects of model incompleteness on the drift-scan calibration of radio telescopes | Autori: | Gehlot, Bharat K. Jacobs, Daniel C. Bowman, Judd D. Mahesh, Nivedita Murray, Steven G. Kolopanis, Matthew Beardsley, Adam P. Abdurashidova, Zara Aguirre, James E. Alexander, Paul Ali, Zaki S. Balfour, Yanga BERNARDI, GIANNI Billings, Tashalee S. Bradley, Richard F. Bull, Phil Burba, Jacob Carey, Steve Carilli, Chris L. Cheng, Carina DeBoer, David R. Dexter, Matt de Lera Acedo, Eloy Dillon, Joshua S. 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 Julius, Austin Kern, Nicholas S. Kerrigan, Joshua Kittiwisit, Piyanat Kohn, Saul A. Lanman, Adam La Plante, Paul Lekalake, Telalo Lewis, David Liu, Adrian Ma, Yin-Zhe MacMahon, David Malan, Lourence Malgas, Cresshim Maree, Matthys Martinot, Zachary E. Matsetela, Eunice Mesinger, Andrei Molewa, Mathakane Monsalve, Raul A. Morales, Miguel F. Mosiane, Tshegofalang Neben, Abraham R. Nikolic, Bojan Parsons, Aaron R. Pascua, Robert Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Razavi-Ghods, Nima Ringuette, Jon Robnett, James Rosie, Kathryn Santos, Mario G. Sims, Peter Smith, Craig Syce, Angelo Tegmark, Max Thyagarajan, Nithyanandan Williams, Peter K. G. Zheng, Haoxuan |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 506 | Fascicolo: | 3 | Da pagina:: | 4578 | Abstract: | Precision calibration poses challenges to experiments probing the redshifted 21-cm signal of neutral hydrogen from the Cosmic Dawn and Epoch of Reionization (z ~ 30-6). In both interferometric and global signal experiments, systematic calibration is the leading source of error. Though many aspects of calibration have been studied, the overlap between the two types of instruments has received less attention. We investigate the sky based calibration of total power measurements with a HERA dish and an EDGES-style antenna to understand the role of autocorrelations in the calibration of an interferometer and the role of sky in calibrating a total power instrument. Using simulations we study various scenarios such as time variable gain, incomplete sky calibration model, and primary beam model. We find that temporal gain drifts, sky model incompleteness, and beam inaccuracies cause biases in the receiver gain amplitude and the receiver temperature estimates. In some cases, these biases mix spectral structure between beam and sky resulting in spectrally variable gain errors. Applying the calibration method to the HERA and EDGES data, we find good agreement with calibration via the more standard methods. Although instrumental gains are consistent with beam and sky errors similar in scale to those simulated, the receiver temperatures show significant deviations from expected values. While we show that it is possible to partially mitigate biases due to model inaccuracies by incorporating a time-dependent gain model in calibration, the resulting errors on calibration products are larger and more correlated. Completely addressing these biases will require more accurate sky and primary beam models. | URI: | http://hdl.handle.net/20.500.12386/32316 | URL: | https://academic.oup.com/mnras/article/506/3/4578/6324581 http://arxiv.org/abs/2104.12240v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab2072 | Bibcode ADS: | 2021MNRAS.506.4578G | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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