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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6748
DTSTART:20211209T213000Z
DTEND:20211209T230000Z
DTSTAMP:20260414T192059Z
LAST-MODIFIED:20211209T141325Z
LOCATION:4421 Sterling Hall\, Coffee and cookies 3:30 PM\, Talk begins
  at 3:45 PM
SUMMARY:Winds of Change around Black Holes\, Astronomy Colloquium\, Gr
 eg Sivakoff\, University of Alberta
DESCRIPTION:Accretion disks\, where matter with angular momentum spira
 ls down through a disk\, occur around objects ranging from the younges
 t stars to supermassive black holes. But not all of this material reac
 hes the center of the disk. Instead\, some material is accelerated awa
 y from the disk. These outflows can be ejected in a narrow opening ang
 le (what astronomers call "jets") or can be relatively unfocused (what
  astronomers call “winds”). While we do not know the precise proce
 sses that accelerate and collimate winds and jets\, magnetic fields al
 most certainly play a key role. My team and I study black hole X-ray b
 inaries\, stellar-mass black holes accreting from a nearby star. We co
 mbine observations across the electromagnetic spectrum to learn about 
 the physics of accretion and jets. In this talk\, I will discuss how w
 e have revealed two new windows onto the physics of inflows and outflo
 ws in X-ray binaries: fast variability measured across the electromagn
 etic spectrum (which provides the potential to accurately identify the
  accretion physics that launch relativistic jets) and the modelling of
  changes in the X-ray brightness of black hole X-ray binaries (which i
 mplies that strong winds from the accretion disk are universal). With 
 the advent of new and upcoming facilities\, we have a huge potential t
 o take advantage of these winds of change in the next decade.<br>
\nTh
 is will be a version of the lectures I gave in 2020 on the Canadian As
 sociation of Physicists Lecture Tour\, making it well suited for under
 graduates to attend.
URL:https://www.physics.wisc.edu/events/?id=6748
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