UHECR mass composition from anisotropy of their arrival directions with the Telescope Array SD

被引：0

作者：

Kuznetsov, Mikhail ^{[1
,2
]}

Tinyakov, Peter ^{[1
,2
]}

机构：

[1] Univ Libre Bruxelles, Serv Phys Theor, Blvd Triomphe CP225, B-1050 Brussels, Belgium

[2] Russian Acad Sci, Inst Nucl Res, 60th October Anniversary Prospect 7a, Moscow 117312, Russia

来源：

37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021 | 2022年

基金：

俄罗斯科学基金会; 美国国家科学基金会; 日本学术振兴会; 新加坡国家研究基金会;

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a new method for the estimation of ultra-high energy cosmic ray (UHECR) mass composition from a distribution of their arrival directions. The method employs a test statistic (TS) based on a characteristic deflection of UHECR events with respect to the distribution of luminous matter in the local Universe modeled with a flux-weighed 2MRS catalog. Making realistic simulations of the mock UHECR sets, we show that this TS is robust to the presence of galactic and non-extreme extra-galactic magnetic fields and sensitive to the mass composition of events in a set. We apply the method to Telescope Array surface detector data for 11 years and derive new independent constraints on fraction of protons and iron in p-Fe mix at E > 10 EeV. At 10 < E < 100 EeV the data favors increase of allowed proton fraction and decrease of allowed iron fraction, while at E > 100 EeV - pure iron or even more massive composition. This result is in tension with Auger composition model inferred from spectrum-X-max fit at 2.7 sigma (2.0 sigma) for PT'11 (JF'12) regular GMF model.

引用

页数：10

共 18 条

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