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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4366
DTSTART:20161201T203000Z
DTEND:20161201T100000Z
DTSTAMP:20260408T135120Z
LAST-MODIFIED:20161121T162446Z
LOCATION:4421 Sterling Hall\, NOTE EARLIER TIME 2:30 PM
SUMMARY:Do High Equivalent Width LAEs Exist in the Local Universe? Ins
 ights from a Flux-Limited GALEX LAE sample at z~0.3\, Astronomy Colloq
 uium\, Isak Wold\, University of Texas - Austin
DESCRIPTION:Observational surveys of Lya emitters (LAEs) have proven t
 o be an efficient method to identify and study large numbers of galaxi
 es over a wide redshift range. To understand what types of galaxies ar
 e selected in LAE surveys - and how this evolves with redshift - it is
  important to establish a low-redshift reference sample that can be di
 rectly compared to high-redshift samples.  The lowest redshift where a
  direct Lya survey is possible is at a redshift of z~0.3 via the Galax
 y Evolution Explorer (GALEX ) FUV grism data. Using the z~0.3 GALEX sa
 mple as an anchor point\, it has been suggested that at low redshifts 
 high equivalent width (EW) LAEs become less prevalent and that the amo
 unt of escaping Lya emission declines rapidly.  A number of explanatio
 ns for these trends have been suggested including increasing dust cont
 ent\, increasing neutral column density\, and/or increasing metallicit
 y of star-forming galaxies at lower redshifts. However\, the published
  z~0.3 GALEX sample is pre-selected from bright NUV objects.  Thus\, o
 bjects with strong Lya emission but faint continuum (high-EW LAEs) cou
 ld be missed.  In this talk\, I will present my efforts to re-reduce t
 he deepest archival GALEX FUV grism data and obtain a sample that is n
 ot biased against high-EW LAEs.  I will discuss the implications of th
 is new sample on the evolutionary trends listed above.
URL:https://www.physics.wisc.edu/events/?id=4366
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