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Modelling Foregrounds and Chromaticity in Global 21cm Experiments

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The hyperfine absorption of neutral hydrogen at 21cm can provide a trace of the cosmic dawn and epoch of reionisation. However, the signal must be separated from radio foregrounds of much greater magnitude. In global experiments, which observe the sky averaged monopole 21cm signal with a single antenna, the ability to separate this signal from the foregrounds is greatly limited by distortions arising from chromaticity in the antenna pattern. I present a new method for modelling the foregrounds in a physical sense, which allows for the chromatic distortion to be derived directly from the observed data.

This talk is part of the Cavendish Astrophysics Coffee talks series.

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