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SUMMARY:Accounting for Noise and Singularities in Bayesian Calibration Met
 hods for Global 21-cm Cosmology Experiments - Christian Kirkham (Universit
 y of Cambridge)
DTSTART:20250218T111500Z
DTEND:20250218T120000Z
UID:TALK224671@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:Due to the large dynamic ranges involved with separating the c
 osmological 21-cm signal from the Cosmic Dawn from galactic foregrounds\, 
 a well-calibrated instrument is essential to avoid biases from instrumenta
 l systematics. In this talk I will present three methods for calibrating a
  global 21-cm cosmology experiment to characterise the low noise amplifier
  with a careful consideration of how calibrator temperature noise and sing
 ularities will bias your fit. Running these methods on a suite of simulate
 d datasets based on the REACH receiver design and a lab dataset\, our meth
 ods produce a calibrated antenna solution which is equally as or more accu
 rate than the existing conjugate priors method when compared with an analy
 tic estimate of the calibrator's noise. For lab data I will show that we c
 an calibrate the antenna spectra to within 5\\% of the noise floor.
LOCATION:Coffee area\, Battcock Centre
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