The origin of ultra-high-energy cosmic rays (UHECRs), which reach energy 1020 eV,
remains the mysteries in modern astrophysics. The main obstacles in identifying the origin of …

The identification of the astrophysical objects able to accelerate ultra high-energy cosmic
rays (UHECRs) is a longstanding question in astrophysics. Patterns in the arrival direction …

To understand the origin of ultra-high energy cosmic rays (UHECRs), the study of the
distribution of their arrival directions has always been of capital importance, despite the …

The Telescope Array (TA) and the Pierre Auger Observatory (Auger) are the largest UHECR
detectors in north and south hemispheres, respectively. They have both obtained some …

We investigate the possibility that observations of ultra-high-energy cosmic rays (UHECRs)
in the near future may be able to unveil their local source distribution, which will reflect …

Ultra-high energy cosmic rays (UHECR) are particles with energies above 1 EeV that hit our
atmosphere coming from space. Their origin remains an open question in physics and …

It is almost 50 years since cosmic rays with energies of the order of 100 EeV (1 EeV≡ 1018
eV) were first reported [1]. Soon after the initial observation of such cosmic rays it was …

The origin and nature of ultrahigh-energy cosmic rays (UHECRs, E> 10 18 eV) is one of the
most intriguing unsolved problems of modern astrophysics. This review is dedicated to the …

We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by the
Telescope Array (TA) detector in the first 40 months of operation. Following earlier studies …

We estimate the local number density of sources of ultra-high-energy cosmic rays (UHECRs)
based on the statistical features of their arrival direction distribution. We calculate the arrival …