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Seminars

Multi-messenger tests of high-energy sources of UHECR nuclei and neutrinos

by Anatoli Fedynitch (DESY)

Thursday, 21 September 2017 from to (Europe/Stockholm)
at Å12167
Description
Abstract:
It is not yet evident that a single type of cosmic accelerator can be responsible for the Ultra-High 
Energy Cosmic Ray (UHECR) and the high-energy neutrinos skies at the same time. 
It is important to address this question, since only UHECR observations seem insufficient for 
the discovery of these most violent cosmic accelerators. The possibility to perform "UHECR 
astronomy" is nowadays discouraging after measurements by the Pierre Auger Observatory 
indicated a light nuclear mass composition. For theory, this key observation implies that modern 
source radiation models need to include nuclei, which can disintegrate on dense radiation fields 
of the source and initiate cascades of secondary isotopes. This talk aims to convey the basic 
principles of multi-messenger approaches and currently favoured astrophysical source models, 
demonstrating that none of the promising candidates, like Gamma-Ray Bursts or Blazars, can 
be excluded at this point.