Results from the Telescope Array Experiment

TL;DR

This paper reports on the Telescope Array experiment's findings regarding the spectrum, composition, and anisotropy of ultrahigh energy cosmic rays using hybrid detection methods.

Contribution

It provides new measurements of cosmic ray spectrum, composition, and anisotropy from the largest northern hemisphere experiment, combining surface and fluorescence detectors.

Findings

Spectrum measurement consistent with previous observations.

Composition results suggest a mixed or heavier component at high energies.

No significant correlation found between cosmic ray directions and AGNs.

Abstract

The Telescope Array (TA) is the largest experiment in the northern hemisphere studying ultrahigh energy cosmic rays. TA is a hybrid experiment, which means it has two detector systems: a surface detector and a fluorescence detector. In this paper we report on results from TA on the spectrum, composition, and anisotropy of cosmic rays. The spectrum measured by the TA surface detector, cosmic ray composition measured with the TA fluorescence detectors operating in stereoscopic mode, and a search for correlations between the pointing directions of cosmic rays, seen by the surface detector, and AGN's are presented.