Title

Neutrino Emission from the Direction of the Blazar TXS 0506+056 Prior to the IceCube-170922A Alert

Document Type

Article

Language

eng

Publication Date

7-13-2018

Publisher

American Association for the Advancement of Science

Source Publication

Science

Source ISSN

0036-8075

Abstract

A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted by this association, we investigated 9.5 years of IceCube neutrino observations to search for excess emission at the position of the blazar. We found an excess of high-energy neutrino events, with respect to atmospheric backgrounds, at that position between September 2014 and March 2015. Allowing for time-variable flux, this constitutes 3.5σ evidence for neutrino emission from the direction of TXS 0506+056, independent of and prior to the 2017 flaring episode. This suggests that blazars are identifiable sources of the high-energy astrophysical neutrino flux.

Comments

Science, Vol. 361, No. 6398, (July 13, 2018): 147-151. DOI.

IceCube Collaboration authors and affiliations are listed in the supplementary materials.

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