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http://hdl.handle.net/20.500.12386/27311
Title: | Spectral performance of SKA Log-periodic Antennas I: mitigating spectral artefacts in SKA1-LOW 21 cm cosmology experiments | Authors: | de Lera Acedo, Eloy Trott, Cathryn M. Wayth, Randall B. Fagnoni, Nicolas BERNARDI, GIANNI Wakley, Brett Koopmans, Léon V.E. Faulkner, Andrew J. bij de Vaate, Jan Geralt |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 469 | Issue: | 3 | First Page: | 2662 | Abstract: | This paper is the first in a series of papers describing the impact of antenna instrumental artefacts on the 21 cm cosmology experiments to be carried out by the low frequency instrument (SKA1-LOW) of the Square Kilometre Array telescope (SKA), I.e. the Cosmic Dawn (CD) and the Epoch of Reionization (EoR). The smoothness of the passband response of the current log-periodic antenna being developed for the SKA1-LOW is analysed using numerical electromagnetic simulations. The amplitude variations over the frequency range are characterized using low-order polynomials defined locally, in order to study the impact of the passband smoothness in the instrument calibration and CD/EoR Science. A solution is offered to correct a fast ripple found at 60 MHz during a test campaign at the SKA site at the Murchison Radio-astronomy Observatory, Western Australia in 2015 September with a minor impact on the telescope's performance and design. A comparison with the Hydrogen Epoch of Reionization Array antenna is also shown demonstrating the potential use of the SKA1-LOW antenna for the delay-spectrum technique to detect the EoR. | URI: | http://hdl.handle.net/20.500.12386/27311 | URL: | https://academic.oup.com/mnras/article/469/3/2662/3605382 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx904 | Bibcode ADS: | 2017MNRAS.469.2662D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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deLeraAcedo17.pdf | PDF editoriale | 3.25 MB | Adobe PDF | View/Open |
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