How isotropic can the UHECR flux be?

被引：32

作者：

di Matteo, Armando ^{[1
]}

Tinyakov, Peter ^{[1
]}

机构：

[1] ULB, Serv Phys Theor, CP225 Blvd Triomphe, B-1050 Brussels, Belgium

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 01期

关键词：

astroparticle physics; cosmic rays; ISM: magnetic fields; MAGNETIC-FIELD; COSMIC-RAYS; DEFLECTIONS;

D O I：

10.1093/mnras/sty277

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Modern observatories of ultra-high energy cosmic rays (UHECR) have collected over 104 events with energies above 10 EeV, whose arrival directions appear to be nearly isotropically distributed. On the other hand, the distribution of matter in the nearby Universe - and therefore presumably also that of UHECR sources - is not homogeneous. This is expected to leave an imprint on the angular distribution of UHECR arrival directions, though deflections by cosmic magnetic fields can confound the picture. In this work, we investigate quantitatively this apparent inconsistency. To this end we study observables sensitive to UHECR source inhomogeneities but robust to uncertainties on magnetic fields and the UHECR mass composition. We show, in a rather model-independent way, that if the source distribution tracks the overall matter distribution, the arrival directions at energies above 30 EeV should exhibit a sizeable dipole and quadrupole anisotropy, detectable by UHECR observatories in the very near future. Were it not the case, one would have to seriously reconsider the present understanding of cosmic magnetic fields and/or the UHECR composition. Also, we show that the lack of a strong quadrupole moment above 10 EeV in the current data already disfavours a pure proton composition, and that in the very near future measurements of the dipole and quadrupole moment above 60 EeV will be able to provide evidence about the UHECR mass composition at those energies.

引用

页码：715 / 723

页数：9

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