Restricting UHECRs and cosmogenic neutrinos with Fermi-LATстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Ultrahigh energy cosmic ray (UHECR) protons interacting with the cosmic microwave background
(CMB) produce UHE electrons and gamma-rays that in turn initiate electromagnetic cascades on
CMB and infrared photons. As a result, a background of diffuse isotropic gamma radiation is
accumulated in the energy range E < 100 GeV. The Fermi-LAT collaboration has recently reported a
∼
measurement of the extragalactic diffuse background finding it less intense and softer than previously
measured by EGRET. We show that this new result constrains UHECR models and the flux of
cosmogenic neutrinos. In particular, it excludes models with cosmogenic neutrino fluxes detectable
by existing neutrino experiments, while next-generation detectors as e.g. JEM-EUSO can observe
neutrinos only for extreme parameters.