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SUMMARY:Measuring the diffuse Galactic synchrotron spectral index and curv
 ature between 45 and 2300 MHz - Dr. Melis Irfan (Institute of Astronomy\, 
 University of Cambridge)
DTSTART:20260120T111500Z
DTEND:20260120T120000Z
UID:TALK242284@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:Cosmic Microwave Background and 21cm experiments aim to probe 
 the inflationary period and map the reionization history of the Universe f
 rom the Big Bang through to Cosmic Dawn and the formation of Large-Scale S
 tructure. These two complementary fields span the radio to microwave frequ
 ency regimes and share a common\, pernicious foreground contamination: dif
 fuse Galactic synchrotron emission. Synchrotron emission is the dominant d
 iffuse Galactic emission in intensity across the majority of the sky at fr
 equencies under 1 GHz and at microwave frequencies it makes up one of the 
 two polarised CMB contaminants.\n\nAlthough believed to follow a power law
  distribution in terms of change in temperature across frequency\, diffuse
  Galactic synchrotron emission is particularly difficult to simulate reali
 stically due to its spatially and spectrally varying spectral index. We pr
 esent all-sky maps of the diffuse Galactic synchrotron spectral index and 
 spectral index curvature between 45 and 2300 MHz at 1 degree resolution co
 nstructed from 36 publicly available\, partial sky surveys each with diffe
 ring resolutions. The spectral index and curvature maps\, alongside the Ha
 slam 408 MHz data\, can be used to construct a synchrotron emission model 
 which we show to be more accurate than the Global Sky Model and Python Sky
  Model within the 45 and 2300 MHz frequency range.
LOCATION:Coffee area\, Battcock Centre
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