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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160421T103000
DTEND;TZID=Atlantic/Canary:20160421T113000
UID:iactalks-919
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/919
CREATED:2016-04-21T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Cosmic Foregrounds and Deep Radio Surveys 
DESCRIPTION:Cosmic Foregrounds and Deep Radio Surveys \nDr. Bill Cotton\n\n
 The ARCADE-2 CMB balloon experiment detected an unexplained low  frequency
  component which was postulated to be a previously unknown  population of 
 extragalactic sources.  We conducted a deep 2-4 GHz survey  with the recen
 tly upgraded EVLA to search for this population and to  measure the faint 
 radio source counts.  Faint source counts constrain  the cosmic evolution 
 of the populations represented including sources  powered by star formatio
 n. Previous attempts at measuring faint source counts produced more scatte
 r  in results than are easily accounted for and may reflect the variety of
   techniques used to correct for various effects. I will describe a deep  
 confusion limited analysis using the "P of D" technique to derive the  sou
 rce counts at, and below the confusion which avoids many of the  difficult
  to correct effects.  Results are in excellent agreement with  theoretical
  expectations effectively ruling out the ARCADE-2 anomaly  being due to di
 screte sources. I will also summarize ongoing  observations to determine t
 he size distribution of the microJy  population.
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