Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?

Understand

IceCube has recently reported the discovery of high-energy neutrinos of astrophysical origin, opening up the PeV (10^15 eV) sky.

• Because of their large positional uncertainties, these events have not yet been associated to any astrophysical source.
• We have found plausible astronomical counterparts in the GeV -- TeV bands by looking for sources in the available large area high-energy gamma-ray catalogues within the error circles of the IceCube events.
• We then built the spectral energy distribution of these sources and compared it with the energy and flux of the corresponding neutrino.