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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1960
DTSTART:20101007T203000Z
DTEND:20101007T220000Z
DTSTAMP:20260506T161538Z
LAST-MODIFIED:20100913T160113Z
LOCATION:4421 Sterling Hall  Same Location
SUMMARY:Casting Shadows on the standard intersteller medium paradign w
 ith GALFA-HI\, Astronomy Colloquium\, Josh Peek\, Columbia University
DESCRIPTION:Our understanding of the diffuse interstellar medium (ISM)
  revolves around the balance of pressures between warm and cold phases
  and the interruption of that balance by the explosion of stars in sup
 ernovae. I will show new results enabled by the GALFA-HI survey that t
 hrow these standard theoretical underpinnings into disarray. I will di
 scuss our investigation of the nearest cold neutral medium (CNM) to th
 e sun\, deep within the boundaries of the local cavity. High spectral 
 resolution observations of this object present interesting constraints
  to theorists and simulators who propose that CNM clouds are formed by
  the collision of warmer clouds. Observations of the absorption of sof
 t X-rays by this CNM show that X-rays emanate much nearer to the sun t
 han was thought before\, casting doubt on the local hot bubble theory.
  We have also investigated hundreds of compact HI clouds in our Galaxy
 \, many of which seem to be in extreme force imbalance with the expect
 ed ambient ISM. These finding all suggest we have much to learn about 
 the Galactic ISM we call home. 
URL:https://www.physics.wisc.edu/events/?id=1960
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