Propagation of Ultrahigh Energy Nuclei in Clusters of Galaxies: Resulting Composition and Secondary Emissions

Kotera, Kumiko; Allard, Denis; Murase, Kohta; Aoi, Junichi; Dubois, Yohan; Pierog, T.; Nagataki, Shigehiro

doi:10.1088/0004-637x/707/1/370

Cited by 121 publications

(145 citation statements)

References 114 publications

(143 reference statements)

Supporting

Mentioning

132

Contrasting

Order By: Relevance

“…[4][5][6][7][8]). Various theoretical interpretations include possibilities of hadronic (pp) production in cosmic-ray (CR) reservoirs [9] and photohadronic (pγ) production in hidden CR accelerators [10][11][12][13][14], and the observed neutrino intensity at ∼0.1-1 PeV energies is consistent with earlier models [15][16][17][18]. Only a fraction of the observed events could have Galactic origins (e.g., Refs.…”

supporting

confidence: 57%

Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube

et al. 2015

View full text Add to dashboard Cite

Late time decay of very heavy dark matter is considered as one of the possible explanations for diffuse PeV neutrinos observed in IceCube. We consider implications of multimessenger constraints, and show that proposed models are marginally consistent with the diffuse γ-ray background data. Critical tests are possible by a detailed analysis and identification of the sub-TeV isotropic diffuse γ-ray data observed by Fermi and future observations of sub-PeV γ rays by observatories like HAWC or Tibet AS þ MD. In addition, with several-year observations by next-generation telescopes such as IceCube-Gen2, muon neutrino searches for nearby dark matter halos such as the Virgo cluster should allow us to rule out or support the dark matter models, independently of γ-ray and anisotropy tests.

show abstract

supporting

confidence: 57%

Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube

et al. 2015

View full text Add to dashboard Cite

show abstract

“…With the very flat magnetic field radial profile in the intra-cluster medium predicted by the cosmological simulations of [146], the authors found that particles with rigidity below ∼ 10 19 V were strongly confined and as a result very strong mangnetic horizon effects were expected in the propagated spectrum (depleted below 10 19 eV) and the composition (the intermediate and heavy nuclei being strongly suppressed at all energies). More recently, the escape of UHECRs from galaxy cluster environments was considered in [152]. This study was based on the output of the structure formation simulations by [149] and considered, besides the effect of the intra-cluster magnetic fields (whose radial attenuation was much steeper than in [146]), the enhancement of the photon background due to the contribution of galaxies inside the cluster and the contribution of hadronic interactions.…”

Section: Cosmic Magnetic Fieldsmentioning

confidence: 99%

Extragalactic propagation of ultrahigh energy cosmic-rays

Allard

2012

Astroparticle Physics

125

136

View full text Add to dashboard Cite

In this paper we review the extragalactic propagation of ultrahigh energy cosmic-rays (UHECR). We present the different energy loss processes of protons and nuclei, and their expected influence on energy evolution of the UHECR spectrum and composition. We discuss the possible implications of the recent composition analyses provided by the Pierre Auger Observatory. The influence of extragalactic magnetic fields and possible departures from the rectilinear case are also mentioned as well as the production of secondary cosmogenic neutrinos and photons and the constraints their observation would imply for the UHECRs origin. Finally, we conclude by briefly discussing the relevance of a multi messenger approach for solving the mystery of UHECRs.

show abstract

“…We compute the gamma-ray signal with numerical Monte Carlo simulations, using the code presented in Kotera et al (2009). In a first step, we propagate ultrahigh energy cosmic-rays (protons and heavier nuclei) in one of the three-dimensional magnetic field models described above.…”

Section: Numerical Codementioning

confidence: 99%

Detectability of ultrahigh energy cosmic-ray signatures in gamma-rays

Kotera

Allard

Lemoine

2011

A&A

Self Cite

View full text Add to dashboard Cite

The injection of ultrahigh energy cosmic-rays in the intergalactic medium leads to the production of a GeV-TeV gamma-ray halo centered on the source location, through the production of a high electromagnetic component in the interactions of the primary particles with the radiation backgrounds. This paper examines the prospects for the detectability of such gamma-ray halos. We explore a broad range of astrophysical parameters, including the inhomogeneous distribution of magnetic fields in the large-scale structure, as well as various possible chemical compositions and injection spectra; and we consider the case of a source located outside clusters of galaxies. We demonstrate that the gamma-ray flux associated to synchrotron radiation of ultrahigh energy secondary pairs does not depend strongly on these parameters, and conclude that its magnitude ultimately depends on the energy injected into the primary cosmic-rays. We find that the gamma-ray halo produced by equal luminosity sources (with cosmic ray luminosity and source density chosen to reproduce the measured cosmic-ray spectrum) is far fainter than current or planned instrument sensitivities. Only rare and powerful steady sources, located at distances larger than several hundreds of Mpc and contributing to a fraction 10% of the flux at 10 19 eV might be detectable. We also discuss the gamma-ray halos that are produced by inverse Compton/pair production cascades seeded by ultrahigh energy cosmic-rays. This depends strongly on the configuration of the extragalactic magnetic fields; it is dominated by the synchrotron signal on a degree scale if the filling factor of magnetic fields with B 10 −14 G is smaller than a few percent. Finally, we briefly discuss the case of nearby potential sources such as Centaurus A.

show abstract

Propagation of Ultrahigh Energy Nuclei in Clusters of Galaxies: Resulting Composition and Secondary Emissions

Cited by 121 publications

References 114 publications

Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube

Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube

Extragalactic propagation of ultrahigh energy cosmic-rays

Detectability of ultrahigh energy cosmic-ray signatures in gamma-rays

Contact Info

Product

Resources

About