A Clustered Extragalactic Foreground Model for the EoR

Abstract

We review an improved statistical model of extra-galactic point-source foregrounds first introduced in [Murray 2017], in the context of the Epoch of Reionization. This model extends the instrumentally-convolved foreground covariance used in inverse-covariance foreground mitigation schemes, by considering the cosmological clustering of the sources. In this short work, we show that over scales of $k\sim (0.6,40.)h{\mathrm{Mpc}}^{-1}$, ignoring source clustering is a valid approximation. This is in contrast to [Murray 2017], who found a possibility of false detection if the clustering was ignored. The dominant cause for this change is the introduction of a Galactic synchrotron component which shadows the clustering of sources.

4 pages, 1 figure. Submitted to the Proceedings of the IAU Symposium No. 333 -- Peering Towards Cosmic Dawn

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• Statistical recovery of 21cm visibilities and their power spectra with Gaussian constrained realisations and Gibbs sampling