{"title":"Cosmic ray origin and anisotropy measurement by the Pierre Auger Observatory","authors":"G. Sigl","doi":"10.1393/NCC/I2019-19245-0","DOIUrl":null,"url":null,"abstract":"Recently the Pierre Auger Observatory has observed a dipolar anisotropy of amplitude 6.5% above 8 × 1018 eV that is unrelated to the Galactic plane. While the significance is largest above 8 × 1018 eV, the cosmic ray data indicate a growth of the dipolar amplitude from 4×1018 eV to 3.2×1019 eV and beyond. Furthermore, above 4 × 1019 eV, indications have been found for intermediate-scale anisotropies associated with extragalactic gamma-ray sources. Apart from those indications no other significant anisotropies are seen. We review these observations and discuss their relevance for the origin of ultra-high energy cosmic rays.","PeriodicalId":54452,"journal":{"name":"Rivista Del Nuovo Cimento","volume":null,"pages":null},"PeriodicalIF":5.9000,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rivista Del Nuovo Cimento","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1393/NCC/I2019-19245-0","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Recently the Pierre Auger Observatory has observed a dipolar anisotropy of amplitude 6.5% above 8 × 1018 eV that is unrelated to the Galactic plane. While the significance is largest above 8 × 1018 eV, the cosmic ray data indicate a growth of the dipolar amplitude from 4×1018 eV to 3.2×1019 eV and beyond. Furthermore, above 4 × 1019 eV, indications have been found for intermediate-scale anisotropies associated with extragalactic gamma-ray sources. Apart from those indications no other significant anisotropies are seen. We review these observations and discuss their relevance for the origin of ultra-high energy cosmic rays.
期刊介绍：
La Rivista del Nuovo Cimento is an international peer-reviewed journal. It publishes monographs in all fields of physics. These monographies aim at presenting the state of the art of topical subjects of relevant interest for the community. Usually, authors are invited and topics suggested by the Deputy Editors-in-Chief, but also spontaneous submissions are examined.
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