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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20171116T103000
DTEND;TZID=Atlantic/Canary:20171116T113000
UID:iactalks-1074
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1074
CREATED:2017-11-16T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Exploring the early Universe with the largest emission-line surveys
 , ALMA, HST and the VLT
DESCRIPTION:Exploring the early Universe with the largest emission-line sur
 veys, ALMA, HST and the VLT\nDr. David Sobral\n\nI will present new result
 s regarding the first ~2 Gyrs of cosmic time  using very wide-field Lyman-
 alpha (Lya) narrow-band surveys, including a  large, matched Lya-Halpha su
 rvey to investigate how Lya and  Lyman-continuum (LyC) photons escape from
  typical star-forming  galaxies at high-redshift. We find that large Lya h
 alos are ubiquitous  in star-forming galaxies, and that the typical escape
  fraction of Lya  and LyC photons is typically below a few percent. H
 owever, the escape  fractions of Lya selected sources are significantly  h
 igher. We also find a much higher space density of very luminous  Lyman-al
 pha emitters all the way from z~2 to z~7 than previously  assumed, wh
 ich we confirm spectroscopically with Keck, VLT and WHT. Many  of our sour
 ces show high-ionisation lines in the rest-frame  UV, and some have clear 
 Lya blue wings. Our results also show that the  steep drop in the Lya
  luminosity function into the epoch of  re-ionisation happens only for the
  faint Lya emitters, while the bright  ones likely ionise their own local 
 bubbles very early  on, and thus are visible at the earliest cosmic t
 imes. I will finish  with new exciting ALMA detections of individual [CII]
  clumps at z~7  despite no dust continuum at the epoch of re-ionisation.
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