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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-7968
DTSTART:20221103T203000Z
DTEND:20221103T213000Z
DTSTAMP:20260414T153413Z
LAST-MODIFIED:20221013T204854Z
LOCATION:Sterling Hall 4421
SUMMARY:How Circumgalactic Medium Dynamics Impact Galaxy Evolution\, A
 stronomy Colloquium\, Dr. Cassi Lochhaas\, Space Telescope Science Ins
 titute
DESCRIPTION:The region of space surrounding galaxies\, the circumgalac
 tic medium (CGM)\, is the site of all gas flows into and out of galaxi
 es and therefore responsible for regulating or promoting galaxy growth
 . It has been only in the past couple decades that we have been able t
 o observe this tenuous medium\, and even more recently that we have be
 en able to resolve it in cosmological simulations. I will discuss the 
 classical theories for the CGM’s role in galaxy evolution and how my
  work has shown these theories need serious revision in light of new s
 imulations. Using the Figuring Out Gas & Galaxies In Enzo (FOGGIE) sim
 ulations that resolve the CGM of Milky Way-like galaxies in exquisite 
 detail\, I will describe how dynamic gas motions in the CGM – turbul
 ence\, rotation\, and bulk radial flows – drive the galactic ecosyst
 em out of hydrostatic equilibrium and drive its temperature away from 
 the virial temperature\, ultimately affecting how galaxies accrete new
  gas to convert into stars. These results hint at a new paradigm of no
 n-equilibrium galaxy evolution\, where the commonly-assumed balance be
 tween gas flows and star formation in galaxies is actually an emergent
  phenomenon that appears only through averaging over large scales in s
 pace and time.
URL:https://www.physics.wisc.edu/events/?id=7968
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