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Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand.
DESY, D-15738 Zeuthen, Germany.
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand.
Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium.
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2018 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 361, no 6398, p. 147-151Article in journal (Refereed) Published
Abstract [en]

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 3.5 sigma 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.

Place, publisher, year, edition, pages
2018. Vol. 361, no 6398, p. 147-151
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-362011DOI: 10.1126/science.aat2890ISI: 000438449200038PubMedID: 30002248OAI: oai:DiVA.org:uu-362011DiVA, id: diva2:1253209
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Polar Research SecretariatSwedish National Infrastructure for Computing (SNIC)Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2019-05-21Bibliographically approved

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Botner, OlgaBurgman, AlexanderHallgren, Allande los Heros, CarlosUnger, Elisabeth
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