Fig. 1
Scheme of the present investigation: we assume that a part of the high energy neutrino signal seen by IceCube includes extragalactic neutrinos. We investigate whether the extragalactic emission can be attributed largely or fully to BL Lac emission, relying on the fact that a large fraction of BL Lacs, as discussed in Sect. 2, is observed by Fermi-LAT.
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