Full-Sky Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC

During the past two decades, experiments in both the Northern and Southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of galactic cosmic rays. The relative amplitude of the anisotropy is \(10^{-4} - 10^{-3}\). However,...

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Bibliographic Details
Published in:arXiv.org 2015-10
Main Authors: The HAWC Collaboration, The IceCube Collaboration
Format: Article
Language:English
Subjects:
Anisotropy
Correlation analysis
Cosmic rays
Field of view
Galactic cosmic rays
Hemispheres
High altitude
Multipoles
Neutrinos
Observatories
South Pole
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Summary:During the past two decades, experiments in both the Northern and Southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of galactic cosmic rays. The relative amplitude of the anisotropy is \(10^{-4} - 10^{-3}\). However, each of these individual measurements is restricted by limited sky coverage, and so the pseudo-power spectrum of the anisotropy obtained from any one measurement displays a systematic correlation between different multipole modes \(C_\ell\). To address this issue, we present the preliminary status of a joint analysis of the anisotropy on all angular scales using cosmic-ray data from the IceCube Neutrino Observatory located at the South Pole (\(90^\circ\) S) and the High-Altitude Water Cherenkov (HAWC) Observatory located at Sierra Negra, Mexico (\(19^\circ\) N). We describe the methods used to combine the IceCube and HAWC data, address the individual detector systematics and study the region of overlapping field of view between the two observatories.
ISSN:2331-8422