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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20221215T103000
DTEND;TZID=Atlantic/Canary:20221215T113000
UID:iactalks-1625
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1625
CREATED:2022-12-15T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: The most luminous starbursts in the early Universe: a different pe
 rspective on massive galaxy formation
DESCRIPTION: The most luminous starbursts in the early Universe: a differen
 t perspective on massive galaxy formation\nDr. Rui Marques-Chaves\n\nIn th
 is talk, I will present recent results on a new sample of extremely UV-lum
 inous star-forming galaxies at z=2-4 discovered within the 9000deg^2-wide 
 Baryon Oscillation Spectroscopic Survey database of the Sloan Digital Sky 
 Survey. These puzzling sources show apparent magnitudes rivaling those of 
 bright QSOs, but without any hint of AGN activity or being magnified by gr
 avitational lensing. Instead, these sources are characterized by very youn
 g stellar populations (~ 10 Myr) and compact morphologies. The two highest
 -redshift sources in our sample show very high Lyman continuum (LyC, with 
 >13.6 eV) escape fractions, up to fesc(LyC)~90%, being the most powerfu
 l ionizing sources identified so far among the star-forming galaxy populat
 ion, both in terms of the intrinsic LyC photon production rate and escape.
  With SFRs~1000 Msun/yr, but almost un-obscured, and specific star formati
 on sSFR >50-100 Gyr^-1, these sources are very efficient star-forming g
 alaxies, possibly representing a short-lived phase in the evolution of mas
 sive and compact galaxies. I will highlight some unique properties observe
 d in these sources including LyC emission, complex Lyman-alpha profiles, s
 trong wind lines, SEDs, among others. Finally, I discuss the properties of
  these UV-bright sources in the broad context of galaxy formation and evol
 ution, and possible implications to cosmic reionization.
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