Testing the correlations between ultra-high-energy cosmic rays and BL Lac type objects with HiRes stereoscopic data

TL;DR

This study tests the correlation between BL Lac objects and ultra-high-energy cosmic rays using HiRes stereoscopic data, supporting the idea that BL Lacs could be cosmic ray sources and indicating a small fraction of neutral primaries at very high energies.

Contribution

It provides empirical evidence supporting BL Lacs as potential sources of ultra-high-energy cosmic rays using stereoscopic data analysis.

Findings

Supports BL Lacs as cosmic ray sources

Suggests a small fraction of neutral primaries at E>10^{19} eV

Uses HiRes stereoscopic data for correlation analysis

Abstract

Previously suggested correlations of BL Lac type objects with the arrival directions of the ultra-high-energy cosmic ray primaries are tested by making use of the HiRes stereoscopic data. The results of the study support the conclusion that BL Lacs may be the cosmic ray sources and suggest the presence of a small (a few percent) fraction of neutral primaries at E>10^{19} eV.