Abstract
The Telescope Array (TA) is the largest ultra-high-energy cosmic-ray (UHECR) detector in the northern hemisphere. It consists of an array of 507 surface detectors (SD) covering a total 700 km2 and three fluorescence detector stations overlooking the SD array. In this proceedings, we summarize recent results on the search for directional anisotropy of UHECRs using the latest dataset collected by the TA SD array. We obtained hints of the anisotropy of the UHECRs in the northern sky from the various analyses.
Highlights
The observable sources of super-GZK ultra high energy cosmic ray (UHECR) events are thought to be limited to the local universe within distances of ∼100 Mpc for proton/iron
We have summarized recent results on the search for directional anisotropy of UHECRs using the data collected by the Telescope Array (TA) surface detectors (SD) array as follows
For events with E>57 EeV, the TA event distribution is consistent with the large-scale structure (LSS) hypothesis at middle-scale smearing angles (10◦-25◦), while the compatibility with the isotropic hypothesis is poor
Summary
The observable sources of super-GZK ultra high energy cosmic ray (UHECR) events are thought to be limited to the local universe within distances of ∼100 Mpc for proton/iron. In order to accelerate particles up to the ultrahigh-energy range, particles must be confined to the accelerator site for more than a million years by a strong magnetic field and/or a large-scale confinement volume [1]. This would limit the number of possible accelerators in the universe to astrophysical candidates such as galaxy clusters, supermassive black holes in active galactic nuclei (AGNs), jets and lobes of active galaxies, starburst galaxies, gamma-ray bursts, etc. The largest UHECR detector in each hemisphere, Telescope Array (TA) in the north and Pierre Auger Observatory (Auger) in the south have both obtained some hints/evidence of anisotropy in cosmic-ray arrival direc-. We summarize recent anisotropy studies made with data collected by the Telescope Array surface detector array
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