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SUMMARY:Star formation in the first billion years: puzzles and insights fr
 om JWST
DTSTART:20260422T113000Z
DTEND:20260422T123000Z
DTSTAMP:20260428T225000Z
UID:indico-event-9512@indico.fysik.su.se
DESCRIPTION:Speakers: Viola Gelli (NBI/DAWN\, UCPH\, Denmark)\n\nThe first
  billion years after the Big Bang mark a critical phase in cosmic history\
 , when the first galaxies formed and began shaping the Universe we observe
  today. The James Webb Space Telescope (JWST) has revealed a surprising nu
 mber of UV-bright galaxies at z>10 as well as the first quiescent\, low-
 mass galaxies already in place by z∼6. The coexistence of these extreme
  sources challenges standard models of galaxy formation and raises fundame
 ntal questions: was star formation different in the early Universe? What p
 hysical processes regulated it? In this talk\, I will discuss how JWST obs
 ervations are challenging our understanding of star formation regulation\,
  but provide critical opportunities to gain insights into the underlying p
 hysical processes.Cosmological simulations predict that high-z galaxies ex
 hibit bursty\, time-variable star formation histories\, with temporary qui
 escent phases dominating at low masses (M* < 10^8 Msun) and faint luminosi
 ties (M_UV > –17). However\, they underpredict JWST observed fractions\,
  suggesting stronger feedback mechanisms at z>6.I will also show that gala
 xies undergoing strong bursts can naturally explain luminosity functions u
 p to z~12\, but fail to reproduce those at z~14\, implying additional phys
 ical processes must enhance the UV luminosity in the highest redshift gala
 xies.\nI will discuss how bursty SFHs are expected to affect other key qua
 ntities\, including galaxy clustering\, reionization history\, and the dis
 tributions of spectral features such as UV slopes and emission line streng
 ths. These predictions will help us constrain the stochasticity in high-z 
 galaxies and unveil the physical processes regulating their evolution.\n\n
 https://indico.fysik.su.se/event/9512/
LOCATION:FC61 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9512/
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