On the Excess of Ultra-High Energy Cosmic Rays in the Direction of Centaurus A

Liu, Ruo-Yu; Wang, Xiangyu; Wang, Wei; Taylor, A. M.

doi:10.1088/0004-637x/755/2/139

Cited by 11 publications

(14 citation statements)

References 64 publications

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“…Assuming an Oxygen composition for these events and coupling this information with the lack of lower energy proton anisotropy output by the source/produced en-route, place a maximum distance to the source of 15 Mpc [13]. Furthermore, the required metallicity within the source acceleration zone suggested is surprisingly high, which itself might provide new insight into the nature of the acceleration site.…”

Section: Correlation With Sourcesmentioning

confidence: 95%

“…Alternatively, for a given candidate source, the angular deflection size expected to be introduced by the Galactic magnetic field distortions of the source image may be inferred, in a source composition dependent manner. This second approach was used in [13] for the case of an association of 13 PAO events with the radio galaxy Cen A. Assuming such an association of these events with Cen A is genuine, the UHECR composition of the events was demonstrated to need to be light ( A < 14) in order that the Galactic magnetic fields do not disperse too broadly the arriving CR from this object.…”

Section: Correlation With Sourcesmentioning

confidence: 99%

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Multi-messenger aspects: Composition, propagation, & acceleration

Taylor

2015

EPJ Web of Conferences

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Abstract. Using recent Pierre Auger Observatory results on the UHECR spectrum and composition, the requirements placed on the sources of these particles are discussed. In this sense, the author interprets the term "multi-messenger" throughout as to refer to the additional information provided by the composition. The spatial distribution of these sources is investigated along with the energy distribution of UHECR they output. These investigations reveal the need for local UHECR sources which output a hard spectrum of intermediate/heavy UHECR. These results demand that local (<80 Mpc) UHECR sources exist, placing exciting and difficult requirements on the local extragalactic candidate sources. Angular correlation studies in collaboration with composition information also demonstrated to offer great potential for isolating the UHECR source distance for which an angular clustering of events is found. Specifically, for the case a correlation of the 13 events correlated with the direction of Cen A, it is shown that the composition information, and specifically, the lack of a lower energy proton correlation, can potentially constrain the source distance to be less than 15 Mpc. The fragility of nuclei with accelerators are also used to place constraints are on the source environment. These constraints motivate 0.1-1000 mG strength magnetic fields exist within the source and that quasi-relativistic scatterers are also present. A specific example of a diffuse large scale "nuclei friendly" accelerator, which meets the outline constraints is put forward.

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Section: Correlation With Sourcesmentioning

confidence: 95%

Section: Correlation With Sourcesmentioning

confidence: 99%

Multi-messenger aspects: Composition, propagation, & acceleration

Taylor

2015

EPJ Web of Conferences

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“…The exact composition of particles injected by the source is as yet unknown. In this paper, the composition proposed in references [8,[25][26][27][28] are used. The fundamentals of each model are described below: Composition 1 (C1) [25,26] abundance of the elements in the solar system.…”

Section: Composition Abundance At the Sourcementioning

confidence: 99%

“…Composition 4 (C4) [27] model based on a homogeneous distribution of sources fitted to the energy spectrum and composition data measured by the Pierre Auger Observatory. Composition 5 (C5) [28]…”

Section: Composition Abundance At the Sourcementioning

confidence: 99%

Probing UHECR production in Centaurus A using secondary neutrinos and gamma-rays

Oliveira

Souza

2021

Eur. Phys. J. C

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In this paper the production of neutrinos and photons by ultra high energy cosmic rays (UHECR) interacting with the extragalactic background radiation is studied. Centaurus A is assumed as the prime source of UHECR and the possibility to identify this source by detecting the secondary neutrinos and photons produced in the propagation of UHECR is investigated. Fifteen astrophysical models regarding three extragalactic magnetic fields (EGMF) and five composition abundances are simulated. The flux and arrival direction of neutrinos and photons are investigated. It is shown that the detection of a signal from Cen A with statistical significance is achievable by current observatories in a few years and by proposed experiments in the near future. The dependence of the results on the models is also presented.

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“…Most studies have focused on proton or light nuclei primaries at the highest energies, with the exception of Refs. [1,2,[8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Deflection of ultra-high energy heavy nuclei in the Galactic magnetic field

Giacinti

Kachelrieß

Semikoz

et al. 2013

EPJ Web of Conferences

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Abstract. In this work, we investigate the impacts a potential shift towards a heavy composition at the end of the cosmic ray (CR) spectrum would have on the future data [1,2]. We present detailed simulations for the propagation of ultra-high energy (UHE) heavy nuclei, with E ≥ 60 EeV, within recent Galactic magnetic field (GMF) models. We consider both regular and turbulent components of the GMF. We show that with UHE heavy nuclei, there is no one-to-one correspondence between the arrival directions of cosmic rays measured at Earth and the direction of their extragalactic sources. Sources can have several distorted images on the sky. We compute images of galaxy clusters and of the supergalactic plane in recent GMF models and show the challenges, but also the possibilities, of "ultra-high energy cosmic ray astronomy" with heavy nuclei. Finally, we present a quantitative study of the impact of the GMF on the (de-)magnification of source fluxes, due to magnetic lensing. Such effects cannot be neglected in case of heavy primaries.

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On the Excess of Ultra-High Energy Cosmic Rays in the Direction of Centaurus A

Cited by 11 publications

References 64 publications

Multi-messenger aspects: Composition, propagation, & acceleration

Multi-messenger aspects: Composition, propagation, & acceleration

Probing UHECR production in Centaurus A using secondary neutrinos and gamma-rays

Deflection of ultra-high energy heavy nuclei in the Galactic magnetic field

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