English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

One of the principal systematic constraints on the Epoch of Reionisation(EoR) experiment is the accuracy of the foreground calibration model. Recentresults have shown that highly accurate models of extended foreground sources,and including models for sources in both the primary beam and its sidelobes,are necessary for reducing foreground power. To improve the accuracy of thesource models for the EoR fields observed by the Murchison Widefield Array(MWA), we conducted the MWA Long Baseline Epoch of Reionisation Survey (LoBES).This survey consists of multi-frequency observations of the main MWA EoR fieldsand their eight neighbouring fields using the MWA Phase II extended array. Wepresent the results of the first half of this survey centred on the MWA EoR0observing field (centred at RA(J2000) 0 h, Dec(J2000) -27 deg). This half ofthe survey covers an area of 3069 degrees$^2$, with an average rms of 2.1 mJybeam$^{-1}$. The resulting catalogue contains a total of 80824 sources, with 16separate spectral measurements between 100 and 230 MHz, and spectral modellingfor 78$\%$ of these sources. Over this region we estimate that the catalogue is90$\%$ complete at 32 mJy, and 70$\%$ complete at 10.5~mJy. The overallnormalised source counts are found to be in good agreement with previouslow-frequency surveys at similar sensitivities. Testing the performance of thenew source models we measure lower residual rms values for peeled sources,particularly for extended sources, in a set of MWA Phase I data. The2-dimensional power spectrum of these data residuals also show improvement onsmall angular scales -- consistent with the better angular resolution of theLoBES catalogue. It is clear that the LoBES sky models improve upon the currentsky model used by the Australian MWA EoR group for the EoR0 field.

The MWA Long Baseline Epoch of Reionisation Survey: I. Improved Source Catalogue for the EoR 0 field