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SUMMARY:Gaussian Processes for Systematic Mitigation for Global 21-cm Cosm
 ology Experiments - Christian Kirkham (University of Cambridge)
DTSTART:20240221T131500Z
DTEND:20240221T134000Z
UID:TALK212359@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Radio observations of the neutral hydrogen signal from the Cos
 mic Dawn and Epoch of Reionisation have helped to provide constraints on t
 he properties of the first stars and galaxies. Since this global 21-cm cos
 mological signal from the Cosmic Dawn is effectively constant on observing
  timescales and since effects resulting from systematics will vary with ti
 me\, the effects of these systematics can be mitigated without the need fo
 r a model of the systematic. In this talk I will present a method to accou
 nt for unmodelled time-varying systematics in 21-cm radio cosmology experi
 ments using a Gaussian process method to account for correlations between 
 time bins in a fully Bayesian way. I will finally present a further method
  using Gaussian process regression to calculate a mean fit to the residual
 s over time\, providing a basis for producing a model of the time-varying 
 systematic.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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