A Bayesian analysis of the 69 highest energy cosmic rays detected by the Pierre Auger Observatory

被引：4

作者：

Khanin, Alexander ^{[1
]}

Mortlock, Daniel J. ^{[1
,2
]}

机构：

[1] Imperial Coll London, Astrophys Grp, Blackett Lab, Prince Consort Rd, London SW7 2AZ, England

[2] Imperial Coll London, Dept Math, London SW7 2AZ, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 460卷 / 03期

关键词：

methods: statistical; cosmic rays; ACTIVE GALACTIC NUCLEI; ARRIVAL DIRECTIONS; SPECTRUM; ANISOTROPY; CENTAURUS; SEARCH; ARRAY;

D O I：

10.1093/mnras/stw1165

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The origins of ultrahigh energy cosmic rays (UHECRs) remain an open question. Several attempts have been made to cross-correlate the arrival directions of the UHECRs with catalogues of potential sources, but no definite conclusion has been reached. We report a Bayesian analysis of the 69 events, from the Pierre Auger Observatory (PAO), that aims to determine the fraction of the UHECRs that originate from known AGNs in the Veron-Cety & Verson (VCV) catalogue, as well as AGNs detected with the Swift Burst Alert Telescope (Swift-BAT), galaxies from the 2MASS Redshift Survey (2MRS), and an additional volume-limited sample of 17 nearby AGNs. The study makes use of a multilevel Bayesian model of UHECR injection, propagation and detection. We find that for reasonable ranges of prior parameters the Bayes factors disfavour a purely isotropic model. For fiducial values of the model parameters, we report 68 per cent credible intervals for the fraction of source originating UHECRs of ="TM0001" 0.09<^>{+0.05}_{-0.04}, ="TM0002" 0.25<^>{+0.09}_{-0.08}, ="TM0003" 0.24<^>{+0.12}_{-0.10}, and ="TM0004" 0.08<^>{+0.04}_{-0.03} for the VCV, Swift-BAT and 2MRS catalogues, and the sample of 17 AGNs, respectively.

引用

页码：2765 / 2778

页数：14

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