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Recent Results from Telescope Array

High Energy Astrophysical Phenomena 2019-08-13 v1 Instrumentation and Methods for Astrophysics

Abstract

The Telescope Array (TA) is an experiment to observe Ultra-High Energy Cosmic Rays (UHECRs). TA's recent results, the energy spectrum and anisotropy based on the 6-year surface array data, and the primary composition obtained from the shower maximum Xmax are reported. The spectrum demonstrates a clear dip and cutoff. The shape of the spectrum is well described by the energy loss of extra-galactic protons interacting with the cosmic microwave background (CMB). Above the cutoff, a medium-scale (20 degrees radius) flux enhancement was observed near the Ursa-Major. A chance probability of creating this hotspot from the isotropic flux is 4.0 sigma. The measured Xmax is consistent with the primary being proton or light nuclei for energies 10^18.2 eV - 10^19.2 eV.

Keywords

Cite

@article{arxiv.1503.06961,
  title  = {Recent Results from Telescope Array},
  author = {M. Fukushima},
  journal= {arXiv preprint arXiv:1503.06961},
  year   = {2019}
}

Comments

8 pages, 15 figures, ISVHECRI2014, CERN, August 18th-22nd, 2014

R2 v1 2026-06-22T09:00:29.644Z