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A Bayesian analysis of the 69 highest energy cosmic rays detected by the Pierre Auger Observatory
File | Description | Size | Format | |
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stw1165.pdf | Published version | 2.35 MB | Adobe PDF | View/Open |
Title: | A Bayesian analysis of the 69 highest energy cosmic rays detected by the Pierre Auger Observatory |
Authors: | Khanin, A Mortlock, DJ |
Item Type: | Journal Article |
Abstract: | 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 0.09+0.05 −0.04, 0.25+0.09 −0.08, 0.24+0.12 −0.10, and 0.08+0.04 −0.03 for the VCV, Swift-BAT and 2MRS catalogues, and the sample of 17 AGNs, respectively. |
Issue Date: | 16-May-2016 |
Date of Acceptance: | 12-May-2016 |
URI: | http://hdl.handle.net/10044/1/58655 |
DOI: | https://dx.doi.org/10.1093/mnras/stw1165 |
ISSN: | 0035-8711 |
Publisher: | Oxford University Press (OUP) |
Start Page: | 2765 |
End Page: | 2778 |
Journal / Book Title: | Monthly Notices of the Royal Astronomical Society |
Volume: | 460 |
Issue: | 3 |
Copyright Statement: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Sponsor/Funder: | Science and Technology Facilities Council Science and Technology Facilities Council (STFC) |
Funder's Grant Number: | ST-N000838 ST/N000838/1 |
Keywords: | Science & Technology Physical Sciences Astronomy & Astrophysics methods: statistical cosmic rays ACTIVE GALACTIC NUCLEI ARRIVAL DIRECTIONS SPECTRUM ANISOTROPY CENTAURUS SEARCH ARRAY 0201 Astronomical And Space Sciences |
Publication Status: | Published |
Appears in Collections: | Physics Astrophysics Faculty of Natural Sciences |