Cosmic Ray in the Northern Hemisphere: Results from the Telescope Array Experiment

TL;DR

This paper presents results from the Telescope Array experiment, measuring the spectrum, composition, and source correlations of ultrahigh energy cosmic rays in the northern hemisphere.

Contribution

It provides new measurements of cosmic ray spectrum, composition, and source correlations using a hybrid detection approach in the northern hemisphere.

Findings

Spectrum measured by surface array and fluorescence detectors

Composition results from stereo data

Search for correlations with active galactic nuclei

Abstract

The Telescope Array (TA) is the largest ultrahigh energy (UHE) cosmic ray observatory in the northern hemisphere TA is a hybrid experiment with a unique combination of fluorescence detectors and a stand-alone surface array of scintillation counters. We will present the spectrum measured by the surface array alone, along with those measured by the fluorescence detectors in monocular, hybrid, and stereo mode. The composition results from stereo TA data will be discussed. Our report will also include results from the search for correlations between the pointing directions of cosmic rays, seen by the TA surface array, with active galactic nuclei.