Abstract
The IceCube Collaboration has observed 37 neutrino events in the energy range $30\, TeV\leq E_{\nu} \leq 2$ PeV and the sources of these neutrinos are unknown. Here we have shown that positions of 12 high energy blazars and the position of the FR-I galaxy Centaurus A, coincide within the error circles of ten IceCube events, the later being in the error circle of the highest energy event so far observed by IceCube. Two of the above blazars are simultaneously within the error circles of the Telescope Array hotspot and one IceCube event. We found that the blazar H2356-309 is within the error circles of three IceCube events. We propose that photohadronic interaction of the Fermi accelerated high energy protons with the synchrotron/SSC background photons in the nuclear region of these high energy blazars and AGN are probably responsible for some of the observed IceCube events.
Highlights
In November 2012, the IceCube Collaboration announced the detection of two showerlike events with energies slightly above 1 PeV by analyzing the data taken during May 2010– May 2012 [1].A follow-up analysis of the same data published in November 2013 revealed additional 26 events in the energy range ∼30 to 250 TeV [2]
We show that the positions of 12 high energy blazars and the position of the FR-I galaxy Centaurus A coincide within the error circles of ten IceCube events, the latter being in the error circle of the highest energy event so far observed by IceCube
We found coincidence of the positions of 12 HBLs and one radio galaxy, Centaurus A (Cen A), within the error circles of ten IceCube events
Summary
In November 2012, the IceCube Collaboration announced the detection of two showerlike events with energies slightly above 1 PeV by analyzing the data taken during May 2010– May 2012 [1]. A follow-up analysis of the same data published in November 2013 revealed additional 26 events in the energy range ∼30 to 250 TeV [2] Reconstruction of these events shows that 21 events are showerlike, mostly caused by νe and ντ and seven are muon track events. These 28 events have flavors, directions, and energies inconsistent with those expected from the atmospheric muon and neutrino backgrounds and probably this is the first indication of extraterrestrial origin of high energy neutrinos. For a Eν−2 spectrum the best fit diffuse flux obtained by IceCube per flavor is Fν = (0.95 ± 0.3) × 10−8 GeV cm−2 s−1 sr−1, which is consistent with the Waxman– Bahcall bound [4] The observation of these neutrinos triggered a lot of excitement as regards understanding of their origin and production mechanism. In this work we focus our analysis on these candidate sources to find how the IceCube events with the desired energies can be produced through photohadronic interaction within the core region of the emanating jets
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