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Parametrizing Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the Murchison Widefield Array

Offringa, A.; Trott, C. M.; Hurley-Walker, Natasha; Johnston-Hollitt, M; McKinley, B.; Barry, N; Beardsley, A. P.; Bowman, Judd D; Briggs, Franklin; Ewall-Wice, Aaron; Feng, Lu; Greenhill, Lincoln; Loeb, Abraham; Shankar, N.Udaya

Description

Experiments that pursue detection of signals from the Epoch of Reionization (EoR) are relying on spectral smoothness of source spectra at low frequencies. This article empirically explores the effect of foreground spectra on EoR experiments by measuring high-resolution full-polarization spectra for the 586 brightest unresolved sources in one of the Murchison Widefield Array (MWA) EoR fields using 45 h of observation. A novel peeling scheme is used to subtract 2500 sources from the visibilities...[Show more]

CollectionsANU Research Publications
Date published: 2016
Type: Journal article
URI: http://hdl.handle.net/1885/152536
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stw310
Access Rights: Open Access

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