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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8013
DTSTART:20221208T220000Z
DTEND:20221208T230000Z
DTSTAMP:20260414T113226Z
LAST-MODIFIED:20221205T151328Z
LOCATION:CH 4274
SUMMARY:Treasure Maps for Detections of Extreme Energy Cosmic Rays\, N
 PAC (Nuclear/Particle/Astro/Cosmo) Forum\, Anatoli Fedynitch\, Academi
 a Sinica\, Taiwan
DESCRIPTION:The origin of Ultra High Energy Cosmic Rays is a 60-year o
 ld mystery. We show that with more events at the highest energies (abo
 ve 150~EeV) it may be possible to limit the character of the sources a
 nd learn about the intervening magnetic fields. Individual sources bec
 ome more prominent\, relative to the background\, as the horizon dimin
 ishes. An event-by-event\, composition-dependent observatory would all
 ow a ``tomography'' of the sources as different mass and energy groups
  probe different GZK horizons. A major goal here is to provide a metho
 dology to distinguish between steady and transient or highly variable 
 sources. Using recent Galactic magnetic field models\, we calculate ``
 treasure'' sky maps to identify the most promising directions for dete
 cting Extreme Energy Cosmic Rays (EECR) doublets\, events that are clo
 se in arrival time and direction. On this basis\, we predict the incid
 ence of doublets as a function of the nature of the source host galaxy
 . Based on the asymmetry in the distribution of time delays\, we show 
 that observation of doublets might distinguish source models. In parti
 cular the Telescope Array hotspot could exhibit temporal variability a
 s it is in a ``magnetic window'' of small time delays. These considera
 tions could improve the use of data with existing facilities and the p
 lanning of future ones such as Global Cosmic Ray Observatory - GCOS.
URL:https://www.physics.wisc.edu/events/?id=8013
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