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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-7912
DTSTART:20220922T203000Z
DTEND:20220922T213000Z
DTSTAMP:20260423T072251Z
LAST-MODIFIED:20220920T213130Z
LOCATION:Sterling Hall 4421\; via Zoom: https://uwmadison.zoom.us/j/94
 638296290?pwd=YmJLMFh2VlFIQmxDcnF3ejk0ajlzQT09&from=addon
SUMMARY:Characterizing the Multiphase Interstellar Medium in the Milky
  Way and Beyond\, Astronomy Colloquium\, Dr. Nick Pingel\, UW-Madison
DESCRIPTION:The hydrogen gas component of the interstellar medium (ISM
 ) makes up ~75% of the overall mass fraction and exists over a myriad 
 of phases: a cold molecular phase that fuels star formation\, a therma
 lly bi-stable neutral phase (HI)\, and an ionized phase (HII) around r
 egions of massive star formation. The lifecycle of the hydrogen gas in
  the ISM is a fundamental driver of galaxy evolution\; however\, many 
 questions remain open about the interplay between these different phas
 es. For instance\, how does the turbulent warm neutral medium imprint 
 itself on the cold neutral and molecular phases to influence subsequen
 t star formation? I will present observations of HI emission and absor
 ption that\, when analyzed in conjunction\, trace the important phase 
 transition between the cold and warm components of the ISM. These obse
 rvational data come from an assortment of novel surveys: the Galactic 
 ASKAP survey (GASKAP-HI)\, which provides the most sensitive and spati
 ally resolved view of our own Milky Way and nearby Magellanic Clouds\,
  and the Local Group L Band Survey (LGLBS) that extends this view to m
 embers of the Local Group\, including the Milky Way analogue M31. In p
 articular\, we observe the presence of cold HI into the circumgalactic
  medium of the Milky Way that is embedded within a turbulent warm comp
 onent. These unprecedented observations probe the physical state of HI
  over a large range of environments and will provide touchstone HI dat
 a sets for the Magellanic System\, Milky Way\, and Local Group for the
  coming decade.
URL:https://www.physics.wisc.edu/events/?id=7912
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