Neutrino Lighthouse at Sagittarius A*
Y. Bai, A. J. Barger, V. Barger, R. Lu, A. D. Peterson, J. Salvado

TL;DR
This paper explores the potential link between high-energy neutrino events detected by IceCube and X-ray flares from Sagittarius A*, suggesting it could be a point source of such neutrinos and proposing observational tests.
Contribution
It presents evidence of temporal coincidence between IceCube neutrino events and Sagittarius A* flares, proposing Sagittarius A* as a neutrino source and outlining observational strategies for confirmation.
Findings
Event 25 occurred shortly after a Sagittarius A* X-ray flare with high significance.
Two neutrino events occurred within one day, indicating possible burst activity.
Gamma-ray observations could confirm the neutrino source through pion decay signatures.
Abstract
We investigate whether a subset of high-energy events observed by IceCube may be due to neutrinos from Sagittarius A*. We check both spatial and temporal coincidences of IceCube events with other transient activities of Sagittarius A*. Among the seven IceCube shower events nearest to the galactic center, we have found that event 25 has a time very close to (around three hours after) the brightest X-ray flare of Sagittarius A* observed by the Chandra X-ray Observatory with a p-value of 0.9%. Furthermore, two of the seven events occurred within one day of each other (there is a 1.6% probability that this would occur for a random distribution in time). Thus, the determination that some IceCube events occur at similar times as X-ray flares and others occur in a burst could be the smoking gun that Sagittarius A* is a point source of very high energy neutrinos. We point out that if IceCube…
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