Evidence the Galactic contribution to the IceCube astrophysical neutrino flux

We 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 vertical bar b vertical bar < 10 degrees and a deficit at high Galactic latitude vertical bar b vertical bar greater than or similar to 50 degrees. We use Monte-Carlo simulations to show that the inconsistency of the isotropic signal model with the data is at greater than or similar to 3 sigma level, after the account of trial factors related to the choice of the low-energy threshold and Galactic latitude binning in our analysis. (C) 2015 Elsevier B.V. All rights reserved.