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Astrophysics

arXiv:0706.2181 (astro-ph)
[Submitted on 14 Jun 2007]

Title:GZK Photons Above 10 EeV

Authors:Graciela B Gelmini, Oleg Kalashev, Dmitry V. Semikoz
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Abstract: We calculate the flux of "GZK-photons", namely the flux of photons produced by extragalactic nucleons through the resonant photoproduction of pions, the so called GZK effect. This flux depends on the UHECR spectrum on Earth, of the spectrum of nucleons emitted at the sources, which we characterize by its slope and maximum energy, on the distribution of sources and on the intervening cosmological backgrounds, in particular the magnetic field and radio backgrounds. For the first time we calculate the GZK photons produced by nuclei. We calculate the possible range of the GZK photon fraction of the total UHECR flux for the AGASA and the HiRes spectra. We find that for nucleons produced at the sources it could be as large as a few % and as low as 10^{-4} above 10 EeV. For nuclei produced at the sources the maximum photon fraction is a factor of 2 to 3 times smaller above 10 EeV but the minimum could be much smaller than for nucleons. We also comment on cosmogenic neutrino fluxes.
Comments: 20 pages, 9 figures (21 panels), this http URL and this http URL needed to typeset
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.2181 [astro-ph]
  (or arXiv:0706.2181v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2181
Journal reference: JCAP 0711:002,2007
Related DOI: https://doi.org/10.1088/1475-7516/2007/11/002

Submission history

From: Graciela B. Gelmini [view email]
[v1] Thu, 14 Jun 2007 19:41:37 UTC (88 KB)
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