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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-9813
DTSTART:20260924T203000Z
DTEND:20260924T213000Z
DTSTAMP:20261015T133741Z
LAST-MODIFIED:20260914T160820Z
LOCATION:4421 Sterling Hall
SUMMARY:Black Hole Images: What they've taught us so far and how we ca
 n improve them\, Astronomy Colloquium\, Lia Medeiros\, UW-Milwaukee
DESCRIPTION:Horizon-scale observations of accreting supermassive black
  holes with the Event Horizon Telescope (EHT) have opened a new window
  onto strong-field gravity and black-hole accretion. The EHT's 2022 ob
 servations of Sagittarius A* (Sgr A*)\, the black hole at the center o
 f our Galaxy\, provide a new opportunity to test the Kerr metric in a 
 previously unexplored regime. I will discuss the EHT observations of S
 gr A*\, focusing on what they can reveal about fundamental physics\, a
 nd briefly compare these results with the earlier observations of M87*
 . I will then discuss how improvements in both observations and data a
 nalysis can extend these measurements in the near future. In particula
 r\, I will introduce PRIMO\, a machine-learning algorithm for EHT data
  analysis that uses a large library of high-fidelity simulations as a 
 training set. I will show a higher-resolution reconstruction of M87* o
 btained with PRIMO and demonstrate how improved image reconstruction c
 an provide new constraints on both black-hole accretion and strong-fie
 ld gravity.
URL:https://www.physics.wisc.edu/events/?id=9813
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