20.500.12556/RUNG-5332-f69221d2-fa46-f0e4-fcff-a27c1e45f5ae
Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-High Energy Cosmic Rays
Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high energy cosmic ray (UHECR) energies above 10^19 eV using seven years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy-position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, since the supergalactic plane is a fit to the average matter density of the local Large Scale Structure (LSS), UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire field-of-view (FOV) behavior of the strength of intermediate-scale energy-angle correlations. These multiplets are measured in spherical cap section bins (wedges) of the FOV to account for coherent and random magnetic fields. The structure found is consistent with supergalactic deflection, the previously published energy spectrum anisotropy results of TA (the hotspot and coldspot), and toy-model simulations of a supergalactic magnetic sheet. The seven year data post-trial significance of this supergalactic structure of multiplets appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be 4.19σ. The ten years of data post-trial significance is 4.09σ. Furthermore, the starburst galaxy M82 is shown to be a possible source of the TA Hotspot, and an estimate of the supergalactic magnetic field using UHECR measurements is presented.
astroparticle physics
cosmic rays
UHECR
supergalactic plane
multiplets
magnetic deflection
large-scale structure of universe
true
true
false
Angleški jezik
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2020-05-19 12:20:40
2020-05-19 13:23:03
2023-06-09 03:37:55
0000-00-00 00:00:00
2020
0
0
16
2005.07312
2020
0000-00-00
PreprintVObjavi
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
16006915
URN:SI:UNG:REP:UWO6KE0W
Univerza v Novi Gorici
0
1
0