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SUMMARY:Modelling Foregrounds and Chromaticity in Global 21cm Experiments 
 - Dominic Anstey
DTSTART:20191030T110000Z
DTEND:20191030T120000Z
UID:TALK134176@talks.cam.ac.uk
CONTACT:Will Handley
DESCRIPTION:The hyperfine absorption of neutral hydrogen at 21cm can provi
 de a trace of the cosmic dawn and epoch of reionisation. However\, the sig
 nal 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 foreg
 rounds 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.\n
LOCATION:Battcock Tea area
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