Abstract
The association of two IceCube detections, the IceCube-170922A event and a
neutrino flare, with the blazar TXS0506+056, has paved the way for the
multimessenger quest for cosmic accelerators. IceCube has observed many other
neutrinos but their origin remains unknown. To better understand the reason for
the apparent lack of neutrino counterparts we have extended the comprehensive
dissection of the sky area performed for the IceCube-170922A event to all the
70 public IceCube high-energy neutrinos that are well reconstructed and off the
Galactic plane. Using the multi-frequency data available through the Open
Universe platform, we have identified numerous candidate counterparts of
IceCube events. We report here the classification of all the gamma-ray blazars
found and the results of subsequent statistical tests. In addition, we have
checked the 4LAC, 3FHL and 3HSP catalogues for potential counterparts.
Following the dissection of all areas associated with IceCube neutrinos, we
evaluate the data using a likelihood-ratio test and find a 3.23 sigma
(post-trial) excess of HBLs and IBLs with a best-fit of 15 +/- 3.6 signal
sources. This result, together with previous findings, consistently points to a
growing evidence for a connection between IceCube neutrinos and blazars, the
most energetic particle accelerators known in the Universe.
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