University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, October 8th 2018
12:15 pm:
Speaker: Ali Kheirandish, UW - Madison
Subject: The first evidence for the origin of high-energy cosmic neutrinos: multimessenger observation of a flaring blazar

For the first time since the discovery of high-energy cosmic neutrinos in IceCube, a distant gamma ray blazar was identified as a high-energy neutrino source. This represents the first evidence for the origin of very high energy cosmic rays. In this talk, I will review the status of high-energy cosmic neutrino flux measurements and how a multimessenger campaign led to the identification of blazar TXS 0506+056 as the origin of a high energy neutrino. Furthermore, I will discuss how archival data searches showed that the high-energy neutrino flux from the source is dominated by a neutrino burst, which implies flaring sources strongly contribute to the cosmic ray flux. I investigate the contribution of a subclass of flaring blazars to the high-energy neutrino flux and speculate on its connection to the very high-energy cosmic ray observations.

Faculty Host: Vuk Mandic

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