Observation of Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC

Abstract

The High-Altitude Water Cherenkov (HAWC) Observatory, located 4100 m above sea level near Sierra Negra (19${}^{\circ }$ N) in Mexico, is sensitive to gamma rays and cosmic rays at TeV energies. The arrival direction distribution of cosmic rays at these energies shows significant anisotropy on several angular scales, with a relative intensity ranging between 10${}^{-3}$ and 10${}^{-4}$. We present the results of a study of cosmic-ray anisotropy based on more than 86 billion cosmic-ray air showers recorded with HAWC since June 2013. The HAWC cosmic-ray sky map, which has a median energy of 2 TeV, exhibits several regions of significantly enhanced cosmic-ray flux. We present the energy dependence of the anisotropy and the cosmic-ray spectrum in the regions of significant excess.

Presented at the 34th International Cosmic Ray Conference (ICRC2015), The Hague, The Netherlands. See arXiv:1508.03327 for all HAWC contributions

References in corpus (4)

• Anomalous Anisotropies of Cosmic Rays from Turbulent Magnetic Fields
• Solution to the cosmic ray anisotropy problem
• Anisotropy in Cosmic rays from internal transitions in neutron stars
• The TeV Cosmic-Ray Anisotropy from Local Dark Matter Annihilation

Cited by in corpus (2)

• The High Altitude Water Cherenkov Observatory
• Towards a Measurement of the $e^{+}{e}^{-}$ Flux above 1 TeV with HAWC