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Evidence the Galactic contribution to the IceCube astrophysical neutrino flux

Andrii Neronov - No affiliation found

2016/02/15 Full-length article DOI: 10.1016/j.astropartphys.2015.11.002 Journal: Astroparticle Physics

Abstract:

AbstractWe show that the Galactic latitude distribution of IceCube astrophysical neutrino events with energies above 100 TeV is inconsistent with the isotropic model of the astrophysical neutrino flux. Namely, the Galactic latitude distribution of the events shows an excess at low latitudes |b| < 10° and a deficit at high Galactic latitude |b| ≳50°. We use Monte–Carlo simulations to show that the inconsistency of the isotropic signal model with the data is at ≳3σ level, after the account of trial factors related to the choice of the low-energy threshold and Galactic latitude binning in our analysis.