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DTSTART:20170312T100000
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DTSTART;TZID=America/Los_Angeles:20170407T120000
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DTSTAMP:20260527T233502
CREATED:20170221T225206Z
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UID:151-1491566400-1491570000@inpa.lbl.gov
SUMMARY:Pierre Sokolsky (Utah) - Ultra-High Energy Cosmic Rays: Complex Spectral Structure and Evidence for  Anisotropy in the Northern Sky
DESCRIPTION:We present recent results from the Telescope Array (TA) collaboration on the spectrum and anisotropy of cosmic rays from 1015 to 1020 eV. The simple power law spectrum thought to be exhibited by cosmic rays is now known to be considerably more complex\, with at least four features present in this energy region in addition to the spectral cut-off at 5×1019 eV. The evidence for these structures and their possible origin will be discussed. At the highest energies\, a clustering of events ( a “hot spot”)  is observed in the neighborhood of Ursa Major with a 3.4 to 4.0 sigma significance ( depending on methodology). If confirmed\, this would be the first significant observation of a ultra-high energy cosmic ray source. The “hot spot” is consistent with originating from M82\, a nearby starburst galaxy.
URL:https://inpa.lbl.gov/event/pierre-sokolsky-utah/
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