Speaker
Description
The objective of the SKA Foregrounds Data Challenge is to evaluate the accuracy of the different techniques used to extract the cylindrically-averaged power spectrum of the Epoch of Reionization signal, clean from foreground contamination. We use the foreground avoidance method to constrain the EoR signal using 21CMMC, whereby only a small part of the EoR window is utilized. We model our sky comprising of just the EoR signal over 8 by 8 degrees and attenuate it by the provided SKA beam. We assume a flat sky approximation to Fourier Transform the sky, before sampling the visibility cube with the SKA baselines and adding thermal noise. The sampled visibilities are then re-gridded using a Gaussian kernel, and we apply a Blackman-Harris spectral taper. Finally, the 2D power spectrum is computed by cylindrically averaging the re-gridded cube, which is then evaluated against the SKA data using 21CMMC MultiNest sampler. We present the constrained EoR signal devoid of any contamination and instrumentation effect using this method.
| Reasearch area | Epoch of Reionization |
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