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https://hdl.handle.net/2440/121421
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Type: | Journal article |
Title: | Investigation of two Fermi-LAT gamma-ray blazars coincident with high-energy neutrinos detected by IceCube |
Author: | Garrappa, S. Buson, S. Franckowiak, A. Shappee, B.J. Beacom, J.F. Dong, S. Holoien, T.W.S. Kochanek, C.S. Prieto, J.L. Stanek, K.Z. Thompson, T.A. Aartsen, M.G. Ackermann, M. Adams, J. Aguilar, J.A. Ahlers, M. Ahrens, M. Alispach, C. Andeen, K. Anderson, T. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2019; 880(2):103-1-103-17 |
Publisher: | IOP Publishing |
Issue Date: | 2019 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | S. Garrappa … G.C. Hill … A. Kyriacou … A. Wallace … B.J. Whelan … et al. (The Fermi-LAT Collaboration, The ASAS-SN Collaboration, and the IceCube Collaboration) |
Abstract: | After 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. |
Rights: | © 2019. The American Astronomical Society. All rights reserved. |
DOI: | 10.3847/1538-4357/ab2ada |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.3847/1538-4357/ab2ada |
Appears in Collections: | Aurora harvest 8 Physics publications |
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