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dc.contributor.authorOffringa, A.R.-
dc.contributor.authorTrott, C.M.-
dc.contributor.authorSethi, S.K.-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorSubrahmanyan, Ravi- Co-authors-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2016, Vol. 458, p1057-1070en_US
dc.identifier.issn1365-2966 - (online)-
dc.descriptionOpen Accessen_US
dc.description.abstractExperiments 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 with ionospheric and beam corrections, resulting in the deepest, confusion-limited MWA image so far. The resulting spectra are found to be affected by instrumental effects, which limit the constraints that can be set on source-intrinsic spectral structure. The sensitivity and power-spectrum of the spectra are analysed, and it is found that the spectra of residuals are dominated by point spread function sidelobes from nearby undeconvolved sources. We release a catalogue describing the spectral parameters for each measured source.en_US
dc.publisherOxford University Press for The Royal Astronomical Societyen_US
dc.rights2016 The authors & the Royal Astronomical Society.en_US
dc.titleParametrizing epoch of reionization foregrounds: a deep survey of low-frequency point-source spectra with the Murchison Widefield arrayen_US
Appears in Collections:Research Papers (A&A)

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