Mon. Not. R. Astron. Soc., 457, 3582-3592 (2016/April-3)
Extreme blazars as counterparts of IceCube astrophysical neutrinos.
PADOVANI P., RESCONI E., GIOMMI P., ARSIOLI B. and CHANG Y.L.
Abstract (from CDS):
We explore the correlation of γ-ray emitting blazars with IceCube neutrinos by using three very recently completed, and independently built, catalogues and the latest neutrino lists. We introduce a new observable, namely the number of neutrino events with at least one γ-ray counterpart, Nν. In all three catalogues we consistently observe a positive fluctuation of Nν with respect to the mean random expectation at a significance level of 0.4-1.3 per cent. This applies only to extreme blazars, namely strong, very high energy γ-ray sources of the high energy peaked type, and implies a model-independent fraction of the current IceCube signal ∼10-20 per cent. An investigation of the hybrid photon - neutrino spectral energy distributions of the most likely candidates reveals a set of ≃5 such sources, which could be linked to the corresponding IceCube neutrinos. Other types of blazars, when testable, give null correlation results. Although we could not perform a similar correlation study for Galactic sources, we have also identified two (further) strong Galactic γ-ray sources as most probable counterparts of IceCube neutrinos through their hybrid spectral energy distributions. We have reasons to believe that our blazar results are not constrained by the γ-ray samples but by the neutrino statistics, which means that the detection of more astrophysical neutrinos could turn this first hint into a discovery.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
neutrinos - radiation mechanisms: non-thermal - pulsars: general - BL Lacertae objects: general - gamma-rays: galaxies
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