AsianScientist (Jul. 26, 2018) – In a study published in Science, an international team of researchers announced that it has identified the source of an ultra-high energy neutrino first detected in 2017.
On September 22, 2017 the IceCube experiment at Amundsen Scott station in Antarctica detected an ultra-high energy neutrino coming from outer space and was able to determine the direction it came from within a range of about one degree, using a system developed by researchers at Chiba University. While narrow compared to the entire sky, one degree still contains many possible candidates for the source object.
OISTER, a network of Japanese university telescopes and the 8-m Subaru Telescope in Hawaii, was used to perform follow-up observations to determine the source of this enigmatic neutrino. They found that an object named TXS 0506+056 was acting peculiarly, shining three times brighter than normal, and fluctuating more than usual.
TXS 0506+056 is a blazar, superheated matter releasing abundant radiation as it slowly spirals down into a supermassive black hole. A quick calculation showed that the odds of two freak occurrences (the ultra-high energy neutrino and a flaring blazar) occurring so close together in time and space by pure chance is effectively zero, unless the two phenomena are related. Therefore TXS 0506+056 must be the source object of the neutrino.
“We congratulate all members of the IceCube and OISTER teams on this important discovery. We are proud that the Subaru Telescope with its deep observation capability could play a small role in this discovery. In this era of multi-messenger astronomy, collaboration between different observing facilities will be increasingly important. We look forward to working with this team more in the future,” said Professor Michitoshi Yoshida, director of the Subaru Telescope facility.
The article can be found at: The IceCube Collaboration et al. (2018) Multimessenger Observations of a Flaring Blazar Coincident With High-energy Neutrino IceCube-170922A.
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Source: National Institutes of Natural Sciences; Photo: National Astronomical Observatory of Japan.
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