Analysis of CALET Data for Anisotropy in Electron+Positron Cosmic Rays

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ICRC2019_112.pdf (3.99 MB)

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https://pos.sissa.it/358/112/

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https://doi.org/10.22323/1.358.0112
 http://hdl.handle.net/11603/25355

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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https://orcid.org/0000-0003-2916-6955

Date

2021-07-02

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conference papers and proceedings
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Citation of Original Publication

“Analysis of CALET Data for Anisotropy in Electron+Positron Cosmic Rays,” H. Motz and Y. Asaoka for the CALET Collaboration, Proceedings of Science: 36th International Cosmic Ray Conference , (Madison, WI), 112 (2019). https://doi.org/10.22323/1.358.0112

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The ISS-based Calorimetric Electron Telescope (CALET) is directly measuring the energy spectrum and direction distribution of electron+positron cosmic-rays up to 20 TeV. A main goal of CALET is to identify a signature of a nearby supernova remnant in electron+positron cosmic-rays, such as a spectral feature in the TeV region and/or a detectable anisotropy. The electron+positron events measured by CALET have been analyzed for a possible dipole anisotropy, as well as higher multipole moments. The methods for deriving limits on the anisotropy from the reconstructed events, as well as the procedures to compensate for the non-uniform exposure to the sky and inhomogeneous acceptance of the detector are explained. Preliminary results for the measured anisotropy and upper limits depending on threshold energy are presented, together with sensitivity estimations and a comparison to the expected anisotropy caused by the Vela supernova remnant.