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IMAGE: The Zwicky Transient Facility captured this snapshot of tidal disruption event AT2019dsg, circled, on Oct. 19, 2019.
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Credit: ZTF/Caltech Optical Observatories
For only the second time, astronomers have linked an elusive particle called a high-energy neutrino to an object outside our galaxy. Using ground- and space-based facilities, including NASA s Neil Gehrels Swift Observatory, they traced the neutrino to a black hole tearing apart a star, a rare cataclysmic occurrence called a tidal disruption event.
Astrophysicists have long theorized that tidal disruptions could produce high-energy neutrinos, but this is the first time we ve actually been able to connect them with observational evidence, said Robert Stein, a doctoral student at the German Electron-Synchrotron (DESY) research center in Zeuthen, Germany, and Humboldt University in Berlin. But it seems like this particular event, called AT2019dsg, didn t generate the neu ....

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