Can FSRQs produce the IceCube detected diffuse neutrino emission?
作者： Bin Wang , Zhuo Li
DOI: 10.1007/S11433-015-5759-3
关键词:
摘要: IceCube has reported the detection of a diffuse TeV-PeV neutrino emission, for which flat spectrum radio quasars (FSRQs) have been proposed to be candidate sources. Here we assume that flux from FSRQs is proportional their gamma-ray ones, and obtain gamma-ray/neutrino ratio by Fermi-LAT measurement detected IceCube. We apply this individual hence predict flux. find large fraction northern sky in point source search predicted above upper limit; sample stacking neutrinos IceCube, stacked even larger than limit orders magnitude. Therefore searches, combined with observations, already rejects as main sources IceCube-detected neutrinos: can only account <10% (4%) flux, according searches whole (northern) sky. The derived neutrino/gamma-ray <<1, also implying emission cannot produced secondary leptons photons pion production processes. caveat assumptions discussed.
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