Observation of CR Anisotropy with ARGO-YBJ

TL;DR

This paper reports the observation of cosmic ray anisotropies at various angular scales, revealing potential unknown magnetic field features and nearby sources influencing cosmic ray propagation.

Contribution

It presents the first observation of new weaker excesses and anisotropy regions at different scales, enhancing understanding of cosmic ray propagation.

Findings

Detection of anisotropy regions at different angular scales

Observation of new weaker excesses in specific sky regions

Evidence suggesting unknown magnetic field features or nearby sources

Abstract

The measurement of the anisotropies of cosmic ray arrival direction provides important informations on the propagation mechanisms and on the identification of their sources. In this paper we report the observation of anisotropy regions at different angular scales. In particular, the observation of a possible anisotropy on scales between $\sim$ 10 $^{\circ}$ and $\sim$ 30 $^{\circ}$ suggests the presence of unknown features of the magnetic fields the charged cosmic rays propagate through, as well as potential contributions of nearby sources to the total flux of cosmic rays. Evidence of new weaker few-degree excesses throughout the sky region $195^{\circ}\leq$ R.A. $\leq 315^{\circ}$ is reported for the first time.