• IceCube neutrinos provide first evidence for blazars as a source of cosmic rays

    At July 12, 2018, SCIENCE has published two papers which herald a new phase of neutrino and multi-messenger astronomy. The findings of these papers provide, for the first time, evidence for a known blazar as a source of high-energy neutrinos. The neutrinos have been detected by the neutrino observatory IceCube at the South Pole. The blazar (an active galaxy with a jet pointing to the Earth) is known as TXS 0506+056. Observations from radio wavelengths to very high-energy gamma rays provide a complete picture of the flaring source.

    The results obtained with IceCube and with the multi-wavelength campaign bolster the motivation of neutrino astronomers to build the planned detectors with 2-5 times better sensitivity: KM3NeT in the Mediterranean Sea, the Gigaton Volume Detector GVD in Lake Baikal (both already under construction) and IceCube-Gen2 at the South Pole (to be built in the 2020s).  In addition, they boldly demonstrate the power of the emerging field of multi-messenger astronomy!

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