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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-8562
DTSTART:20240201T213000Z
DTEND:20240201T223000Z
DTSTAMP:20260413T223350Z
LAST-MODIFIED:20240103T162832Z
LOCATION:4421 Sterling Hall
SUMMARY:Bursty star formation: physical drivers and implications for J
 WST observations of high-redshift galaxies\, Astronomy Colloquium\, Ch
 ris Hayward\, CCA
DESCRIPTION:A complete theory of galaxy formation requires understandi
 ng the details of how gas is converted into stars over cosmic time\, w
 hich is affected by gas supply\, star formation\, and feedback-driven 
 outflows. Based on the results of state-of-the-art cosmological zoom s
 imulations\, I will argue that galaxy formation is a violent process: 
 at high redshift\, stellar feedback causes all star-forming galaxies t
 o undergo rapid fluctuations in their star formation rates on ~10-Myr 
 timescales. Bursts of star formation are followed by strong outflows\,
  which cause the star formation rate to drop precipitously. Fresh gas 
 supply from galactic fountains rejuvenates star formation and restarts
  the cycle. At z ~ 1\, simulations of massive galaxies exhibit a quali
 tative transition: outflows are no longer driven effectively\, and the
  galaxies transition to steadily star-forming\, well-order disk galaxi
 es. I will discuss the physical causes of bursty star formation and th
 e aforementioned transition to time-steady star formation\, in additio
 n to some implications for JWST observations of high-redshift galaxies
 .
URL:https://www.physics.wisc.edu/events/?id=8562
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