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SUMMARY:Constructing Radio Foreground Maps with REACH - Daniel Robins (Cav
 endish Astrophysics)
DTSTART:20251202T111500Z
DTEND:20251202T120000Z
UID:TALK236851@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:The 21cm hyperfine transition of neutral hydrogen is a powerfu
 l probe of Cosmic Dawn and the Epoch of Reionisation.  Global 21cm experim
 ents like REACH aim to detect this faint 21cm hydrogen signal\, which reli
 es on modelling and removing the bright astrophysical foregrounds from the
  calibrated sky temperature. In addition to detecting the 21cm signal\, th
 is allows us to recover low-frequency radio foreground maps at continuous 
 frequencies.\n\nTo build these radio maps\, we divide the sky into regions
  parametrised by their spectral index\, scale using an existing base map\,
  then convolve with the antenna beam.  Fitting the foreground model using 
 nested sampling yields the Bayesian evidence\, which is used to set the mo
 del complexity.  We compare the effect of different foreground models on t
 he recovered sky maps.  Our goal is to produce the first continuous-freque
 ncy sky map in the 50 – 150 MHz REACH band.
LOCATION:Coffee area\, Battcock Centre
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