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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3526
DTSTART:20141113T213000Z
DTEND:20141113T230000Z
DTSTAMP:20260416T144441Z
LAST-MODIFIED:20141113T145206Z
LOCATION:4421 Sterling Hall
SUMMARY:Faint Lyman-alpha Emitters and the Reionization of the Univers
 e\, Astronomy Colloquium\, Alan Dressler\, Carnegie Observatories
DESCRIPTION:There is general agreement that the photons that reionize 
 the universe beginning at z ~ 12 are produced by young\, starforming g
 alaxies\, however\, the brighter galaxies that are readily detected at
  z > 5 fall well short of supplying the required flux of Lyman-continu
 um  photons.   I will describe an 8-year spectroscopic search with IMA
 CS on Magellan for the faintest Lyman-alpha emitters (LAEs) at z= 5.7.
   Our study has pushed the detection limit an order-of-magnitude faint
 er than the prominent narrow-band-imaging surveys\,leading to the firs
 t robust measurement of the faint-end-slope of the luminosity function
 .  We find that LAEs make a substantial\, perhaps dominant\, contribut
 ion in the final stages of reionization.  These young\, low-mass galax
 ies -- more numerous than today's L* galaxies -- are likely to play an
  important role in the assembly of early galaxies and their chemical e
 nrichment of the early IGM.
URL:https://www.physics.wisc.edu/events/?id=3526
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