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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-9013
DTSTART:20241217T180000Z
DTEND:20241217T200000Z
DTSTAMP:20260413T223405Z
LAST-MODIFIED:20241202T201107Z
LOCATION:B343 Sterling
SUMMARY:Odd Radio Circles and the Dynamics of Nonthermal Plasma\, Prel
 iminary Exam\, Yiting Wang\, Physics PhD Graduate Student
DESCRIPTION:Odd Radio Circles (ORCs) are a newly discovered class of r
 ing-like radio sources\, with diameters of ∼ 1 arcminute\, steep spe
 ctral indices between 0.5 and 1.7\, and estimated physical radii on th
 e order of several hundred kiloparsecs. The physical nature and origin
 s of ORCs remain unclear. In the first project\, I present results fro
 m three-dimensional magnetohydrodynamic (MHD) simulations that model O
 RCs as synchrotron-emitting vortex rings produced by Richtmyer-Meshkov
  instability during shock-bubble interactions. A planar shock wave enc
 ounters a low-density bubble\, leading to the formation of torus-like 
 structures whose predicted properties align with observations of ORCs.
  The second project explores an alternative hypothesis that ORCs are e
 nd-on projections of late-stage evolution of radio bubbles driven by a
 ctive galactic nuclei (AGN) jets. We model AGN jets viewed along the l
 ine of sight to assess whether their emission profiles and morphologie
 s can account for the characteristics of ORCs. In the final part of th
 e presentation\, I outline my ongoing work on radiation drag in relati
 vistic jets. This project aims to understand how interactions with rad
 iation fields affect the energy transfer and instability in jets dynam
 ics.
URL:https://www.physics.wisc.edu/events/?id=9013
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