Kavli Affiliate: Roger D. Blandford
| First 5 Authors: Noemie Globus, Anatoli Fedynitch, Roger D. Blandford, ,
| Summary:
The origin of Ultra High Energy Cosmic Rays is a 60-year old mystery. We show
that with more events at the highest energies (above 150~EeV) it may be
possible to limit the character of the sources and learn about the intervening
magnetic fields. Individual sources become more prominent, relative to the
background, as the horizon diminishes. An event-by-event, composition-dependent
observatory would allow a “tomography” of the sources as different mass and
energy groups probe different GZK horizons. A major goal here is to provide a
methodology 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 detecting Extreme Energy
Cosmic Rays (EECR) doublets, events that are close in arrival time and
direction. On this basis, we predict the incidence 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 particular the Telescope Array hotspot could
exhibit temporal variability as it is in a “magnetic window” of small time
delays. These considerations could improve the use of data with existing
facilities and the planning of future ones such as Global Cosmic Ray
Observatory – GCOS.
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