A Novel Study Connecting Ultra-High Energy Cosmic Rays, Neutrinos, and Gamma-Rays
Coenders, Stefan ; Resconi, Elisa ; Padovani, Paolo ; ...Giommi, Paolo ; et al.
Jan - 2018
DOI: 10.7566/JPSCP.19.011021

Event Title : JPS Conf. Proc. 19, 011021 (2018)
Published in: Proceedings of 2016 International Conference on Ultra-High Energy Cosmic Rays (UHECR2016)
Publisher: JPS
type: Conference Proceedings

We present a novel study connecting ultra-high energy cosmic rays, neutrinos, and gamma-rays with the objective to identify common counterparts of the three astrophysical messengers. In the test presented here, we first identify potential hadronic sources by filtering gamma-ray emitters that are in spatial coincidence with IceCube neutrinos. Subsequently, these objects are correlated against ultra-high energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array, scanning in gamma-ray flux and angular separation between sources and cosmic rays. A maximal excess of 80 cosmic rays (41.9 expected) is observed for the second catalog of hard Fermi-LAT objects of blazars of the high synchrotron peak type. This corresponds to a deviation from the null-hypothesis of 2.94σ . No excess is observed for objects not in spatial connection with neutrinos. The gamma-ray sources that make up the excess are blazars of the high synchrotron peak type.

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