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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-8246
DTSTART:20230503T160000Z
DTEND:20230503T060000Z
DTSTAMP:20260414T033133Z
LAST-MODIFIED:20230417T144035Z
LOCATION:4274 Chamberlin
SUMMARY:Multi-Messenger Searches for High Energy Cosmic Ray Accelerato
 rs\, Preliminary Exam\, David Guevel\, Physics Graduate Student
DESCRIPTION:The sources of the highest energy cosmic rays are unknown.
  Within the Milky Way\, cosmic rays\, which are high energy protons an
 d nuclei\, are accelerated to a few PeV by accelerators which have yet
  to be identified. Even higher energy cosmic rays are thought to be ac
 celerated by distant active galaxies. In both cases\, cosmic rays them
 selves cannot be directly traced back to their sources because they ar
 e deflected by the magnetic fields they traverse. Multi-messenger obse
 rvations can reveal the origin of the cosmic rays through the underlyi
 ng physics that connects cosmic rays\, gamma-rays\, and neutrinos. I w
 ill present two ongoing works: (1) X-ray observations by Swift-XRT of 
 the Cygnus Cocoon\, a gamma-ray source which has been identified as a 
 likely PeV cosmic ray source within the Milky Way\, can be used to rul
 e out alternative models of gamma-ray emission thus providing evidence
  the cosmic ray acceleration model. (2) IceCube neutrinos are an indic
 ator of high energy cosmic ray production. A cross correlation of IceC
 ube neutrinos with a galaxy catalog can constrain the sources that emi
 t extragalactic cosmic rays.
URL:https://www.physics.wisc.edu/events/?id=8246
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