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dc.contributor.authorGarrappa, S.
dc.contributor.authorBesson, David Zeke
dc.identifier.citationS. Garrappa et al 2019 ApJ 880 103en_US
dc.description.abstractAfter the identification of the gamma-ray blazar TXS 0506+056 as the first compelling IceCube neutrino source candidate, we perform a systematic analysis of all high-energy neutrino events satisfying the IceCube realtime trigger criteria. We find one additional known gamma-ray source, the blazar GB6 J1040+0617, in spatial coincidence with a neutrino in this sample. The chance probability of this coincidence is 30% after trial correction. For the first time, we present a systematic study of the gamma-ray flux, spectral and optical variability, and multiwavelength behavior of GB6 J1040+0617 and compare it to TXS 0506+056. We find that TXS 0506+056 shows strong flux variability in the Fermi-Large Area Telescope gamma-ray band, being in an active state around the arrival of IceCube-170922A, but in a low state during the archival IceCube neutrino flare in 2014/15. In both cases the spectral shape is statistically compatible (≤2σ) with the average spectrum showing no indication of a significant relative increase of a high-energy component. While the association of GB6 J1040+0617 with the neutrino is consistent with background expectations, the source appears to be a plausible neutrino source candidate based on its energetics and multiwavelength features, namely a bright optical flare and modestly increased gamma-ray activity. Finding one or two neutrinos originating from gamma-ray blazars in the given sample of high-energy neutrinos is consistent with previously derived limits of neutrino emission from gamma-ray blazars, indicating the sources of the majority of cosmic high-energy neutrinos remain unknown.en_US
dc.publisherAmerican Astronomical Societyen_US
dc.rights© 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectAstroparticle physicsen_US
dc.subjectGalaxies: activeen_US
dc.titleInvestigation of Two Fermi-LAT Gamma-Ray Blazars Coincident with High-energy Neutrinos Detected by IceCubeen_US
kusw.kuauthorBesson, David Zeke
kusw.kudepartmentPhysics and Astronomyen_US
kusw.oanotesPer Sherpa Romeo 01/04/2021:

Astrophysical Journal [Open panel below]Publication Information TitleAstrophysical Journal [English] ISSNs Print: 0004-637X Electronic: 1538-4357 URL Publishers American Astronomical Society [Client Organisation] IOP Publishing [Society Publisher] [Open panel below]Publisher Policy Open Access pathways permitted by this journal's policy are listed below by article version. Click on a pathway for a more detailed view.

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kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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