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Abstract:

A new analysis of the data set from the Pierre Auger Observatory provides evidence for anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative of excess arrivals from strong, nearby sources. The data consist of 5514 events above 20 EeV with zenith angles up to 80 recorded before 2017 April 30. Sky models have been created for two distinct populations of extragalactic gamma-ray emitters: active galactic nuclei from the second catalog of hard Fermi-LAT sources (2FHL) and starburst galaxies from a sample that was examined with Fermi-LAT. Flux-limited samples, which include all types of galaxies from the Swift-BAT and 2MASS surveys, have been investigated for comparison. The sky model of cosmic-ray density constructed using each catalog has two free parameters, the fraction of events correlating with astrophysical objects, and an angular scale characterizing the clustering of cosmic rays around extragalactic sources. A maximum-likelihood ratio test is used to evaluate the best values of these parameters and to quantify the strength of each model by contrast with isotropy. It is found that the starburst model fits the data better than the hypothesis of isotropy with a statistical significance of 4.0σ, the highest value of the test statistic being for energies above 39 EeV. The three alternative models are favored against isotropy with 2.7σ-3.2σ significance. The origin of the indicated deviation from isotropy is examined and prospects for more sensitive future studies are discussed. © 2018. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources
Autor:Aab, A. et al.
Este artículo contiene 392 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 392 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:astroparticle physics; cosmic rays; galaxies: active; galaxies: starburst; methods: data analysis Supporting material: FITS files
Año:2018
Volumen:853
Número:2
DOI: http://dx.doi.org/10.3847/2041-8213/aaa66d
Título revista:Astrophysical Journal Letters
Título revista abreviado:Astrophys. J. Lett.
ISSN:20418205
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v853_n2_p_Aab

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Citas:

---------- APA ----------
(2018) . An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources. Astrophysical Journal Letters, 853(2).
http://dx.doi.org/10.3847/2041-8213/aaa66d
---------- CHICAGO ----------
Aab, A. "An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources" . Astrophysical Journal Letters 853, no. 2 (2018).
http://dx.doi.org/10.3847/2041-8213/aaa66d
---------- MLA ----------
Aab, A. "An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources" . Astrophysical Journal Letters, vol. 853, no. 2, 2018.
http://dx.doi.org/10.3847/2041-8213/aaa66d
---------- VANCOUVER ----------
Aab, A. An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources. Astrophys. J. Lett. 2018;853(2).
http://dx.doi.org/10.3847/2041-8213/aaa66d