Acceleration in astrophysics

Colgate, Stirling A.

doi:10.1088/0031-8949/1994/t52/017

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…Thus, their bound does not directly apply to the cosmogenic neutrino flux. In addition, in our opinion, their assumptions on the injection spectra are too narrow: Possible scenarios with hard injection spectra and the AGN redshift evolution assumed here (which is the same as the one used by Waxman-Bahcall) include cases where UHECRs are accelerated by the electromotive force produced by magnetic fields threading the horizons of spinning supermassive black holes in the centers of galaxies [64] or by reconnection events around forming galaxies [65].…”

Section: B Active Galactic Nuclei As Uhecr Sourcesmentioning

confidence: 99%

Ultrahigh-energy neutrino fluxes and their constraints

et al. 2002

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Applying our recently developed propagation code we review extragalactic neutrino fluxes above 10 14 eV in various scenarios and how they are constrained by current data. We specifically identify scenarios in which the cosmogenic neutrino flux above ≃ 10 18 eV, produced by pion production of ultra high energy cosmic rays outside their sources, is considerably higher than the "WaxmanBahcall bound". This is easy to achieve for sources with hard injection spectra and luminosities that were higher in the past. Such fluxes would significantly increase the chances to detect ultra-high energy neutrinos with experiments currently under construction or in the proposal stage.

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Section: B Active Galactic Nuclei As Uhecr Sourcesmentioning

confidence: 99%

Ultrahigh-energy neutrino fluxes and their constraints

et al. 2002

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“…(1), while varying the maximal energy E max . The relatively hard proton spectrum in this scenario could be produced, for example, by acceleration in potential drops or reconnection [40]. We normalize the resulting UHECR flux to the observations above 10…”

Section: The Cosmogenic Neutrino Fluxmentioning

confidence: 99%

Ultra-high energy neutrino fluxes: new constraints and implications

Semikoz

Sigl

2004

J. Cosmol. Astropart. Phys.

129

137

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We apply new upper limits on neutrino fluxes and the diffuse extragalactic component of the GeV γ−ray flux to various scenarios for ultra high energy cosmic rays and neutrinos. As a result we find that extra-galactic top-down sources can not contribute significantly to the observed flux of highest energy cosmic rays. The Z-burst mechanism where ultra-high energy neutrinos produce cosmic rays via interactions with relic neutrinos is practically ruled out if cosmological limits on neutrino mass and clustering apply.

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“…One of the most interesting research topics concerning MHD propagating and planetary shocks is the research on the source and the processes producing the energetic ion events observed by spacecraft near these shocks. In particular, the research on the origin of the ion population(s) near Jupiter' s bow shock is very important, because it extends the relative research near Earth's bow shock and contributes to the problem of the origin of cosmic rays in general [Colgate, 1994]. [Ipavich et al, 1981].…”

Section: Upstream Energetic Ion Phenomenamentioning

confidence: 99%