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SUMMARY:The Cosmic Radio Background: Recent Measurement and Implications -
  Jack Singal (SLAC National Accelerator Centre\, Stanford\, USA)
DTSTART:20100907T153000Z
DTEND:20100907T163000Z
UID:TALK26037@talks.cam.ac.uk
CONTACT:Sally Hales
DESCRIPTION:Results from the ARCADE 2 experiment reveal for the first time
  an extragalactic radio background that is surprisingly bright\, far in ex
 cess of the integrated contribution of discrete radio sources that have be
 en characterised by \ninterferometric surveys to their current flux limits
 .\n   The origin of the radio background has thus provoked some debate.  G
 iven what is known from an analysis of radio source count surveys and cons
 traints from the other cosmological backgrounds\, we have developed a mode
 l to explain the radio background which has interesting astrophysical limi
 tations.\n   In the first part of the talk\, I will present the measuremen
 ts performed by the balloon-borne ARCADE 2 experiment.  In the second part
 \, I will discuss how \nexisting constraints disfavour some explanations o
 f the radio background that have been proposed\, and present the case that
  the background is produced largely by the radio emission of ordinary star
  forming galaxies above \nredshift 1 characterised by an evolving radio to
  far-infrared correlation.\n\n
LOCATION:Ryle Seminar Room\, Cavendish Laboratory
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