Journal article
Observation of Cosmic-Ray Anisotropy in the Southern Hemisphere with 12 yr of Data Collected by the IceCube Neutrino Observatory
The Astrophysical Journal, v 981(2)
10 Mar 2025
Abstract
We analyzed the 7.92 × 1011 cosmic-ray-induced muon events collected by the IceCube Neutrino Observatory from 2011 May 13, when the fully constructed experiment started to take data, to 2023 May 12. This data set provides an up-to-date cosmic-ray arrival direction distribution in the Southern Hemisphere with unprecedented statistical accuracy covering more than a full period length of a solar cycle. Improvements in Monte Carlo event simulation and better handling of year-to-year differences in data processing significantly reduce systematic uncertainties below the level of statistical fluctuations compared to the previously published results. We confirm the observation of a change in the angular structure of the cosmic-ray anisotropy between 10 TeV and 1 PeV, more specifically in the 100–300 TeV energy range. For the first time, we analyzed the angular power spectrum at different energies. The observed variations of the power spectra with energy suggest relatively reduced large-scale features at high energy compared to those of medium and small scales. The large volume of data enhances the statistical significance at higher energies, up to the PeV scale, and smaller angular scales, down to approximately 6° compared to previous findings.
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Details
- Title
- Observation of Cosmic-Ray Anisotropy in the Southern Hemisphere with 12 yr of Data Collected by the IceCube Neutrino Observatory
- Creators
- R AbbasiM AckermannJ AdamsS K AgarwallaT Aguado - Loyola University ChicagoJ A AguilarM AhlersJ M AlameddineN M AminK AndeenC ArgüellesY Ashida - University of UtahS AthanasiadouS N Axani - University of DelawareR BabuX BaiA Balagopal V. - University of DelawareM BaricevicS W Barwick - University of California, IrvineS Bash - Technical University of MunichV BasuR Bay - University of California, BerkeleyJ J BeattyJ Becker TjusJ BeiseC Bellenghi - Technical University of MunichS BenZviD BerleyE BernardiniD Z Besson - University of KansasE BlaufussL Bloom - University of AlabamaS Blot - Deutsches Elektronen-Synchrotron DESYF BontempoJY Book MotzkinC Boscolo MeneguoloS BöserO BotnerJ BöttcherJ BraunB BrinsonZ Brisson-TsavoussisJ Brostean-KaiserL Brusa - RWTH Aachen UniversityR T BurleyD ButterfieldM A CampanaI CaracasK CarloniJ CarpioS ChattopadhyayN Chau - Université Libre de BruxellesZ Chen - Stony Brook UniversityD ChirkinS ChoiB A ClarkC CochlingA ColemanP ColemanG H Collin - Massachusetts Institute of TechnologyA ConnollyJ M ConradR CorleyD F Cowen - Pennsylvania State UniversityC De ClercqJ J DeLaunay - Pennsylvania State UniversityD DelgadoS DengA DesaiP DesiatiK D de VriesG de WasseigeT DeYoungA DiazJ C Díaz-VélezP Dierichs - RWTH Aachen UniversityM DittmerA DomiL Draper - University of UtahH DujmovicD DurnfordK Dutta - Johannes Gutenberg University MainzM A DuVernoisT EhrhardtL Eidenschink - Technical University of MunichA Eimer - Friedrich-Alexander-Universität Erlangen-NürnbergP EllerE EllingerS El MentawiD ElsässerR EngelH ErpenbeckJ Evans - University of Maryland, College ParkP A Evenson - University of DelawareK L Fan - University of Maryland, College ParkK FangK FarragA R FazelyA FedynitchN Feigl
- Publication Details
- The Astrophysical Journal, v 981(2)
- Publisher
- eScholarship, University of California
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Other Identifier
- 991022035174704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics