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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2624
DTSTART:20120315T203000Z
DTEND:20120315T220000Z
DTSTAMP:20260420T062352Z
LAST-MODIFIED:20120307T210415Z
LOCATION:4421 Sterling Hall
SUMMARY:New Results on Gas Flows In and Out of Galaxies\, Astronomy Co
 lloquium\, Alice Shapley\, UCLA
DESCRIPTION:Over the last several years\, there has been growing conse
 nsus in the theoretical literature about the process of galaxy growth 
 through cold gas accretion.  Both analytic calculations and numerical 
 simulations suggest that high-redshift galaxies primarily grow by smoo
 thly accreting cold gas from the surrounding intergalactic medium (IGM
 ).  Furthermore\, simulations indicate that gas is accreted in collima
 ted cool streams containing both smooth gas and small galaxies. While 
 recent theoretical work has identified the importance of cold accretio
 n\, spectroscopic observations have much more consistently indicated t
 he existence of large-scale outflows from star-forming galaxies at hig
 h redshift. Resolving the apparent disconnect between simulations and 
 observations and identifying observational signatures of infalling gas
  are crucial for testing the theoretical paradigm of cold accretion. H
 ere we present new evidence for the smoking gun of cool gas accreting 
 onto star-forming galaxies at high redshift (z~1-3)\, using spectrosco
 py of both HI and heavy elements. We also describe new insights into t
 he properties of outflowing gas around galaxies\, which will provide i
 mportant constraints on models for star-formation feedback.
URL:https://www.physics.wisc.edu/events/?id=2624
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