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https://hdl.handle.net/2440/133449
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Type: | Journal article |
Title: | Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources |
Author: | Abbasi, R. Ackermann, M. Adams, J. Aguilar, J.A. Ahlers, M. Ahrens, M. Alispach, C. Alves, A.A. Amin, N.M. An, R. Andeen, K. Anderson, T. Anton, G. Argüelles, C. Ashida, Y. Axani, S. Bai, X. V., A.B. Barbano, A. Barwick, S.W. et al. |
Citation: | Letters of the Astrophysical Journal, 2021; 920(2) |
Publisher: | IOP Science |
Issue Date: | 2021 |
ISSN: | 2041-8205 2041-8213 |
Statement of Responsibility: | R. Abbasi... R. T. Burley ... G.H Collin... E. J. Roberts ... et al. (IceCube Collaboration) |
Abstract: | A recent time-integrated analysis of a catalog of 110 candidate neutrino sources revealed a cumulative neutrino excess in the data collected by IceCube between 2008 April 6 and 2018 July 10. This excess, inconsistent with the background hypothesis in the Northern Hemisphere at the 3.3σ level, is associated with four sources: NGC 1068, TXS 0506+056, PKS 1424+240, and GB6 J1542+6129. This Letter presents two time-dependent neutrino emission searches on the same data sample and catalog: a point-source search that looks for the most significant time-dependent source of the catalog by combining space, energy, and time information of the events, and a population test based on binomial statistics that looks for a cumulative time-dependent neutrino excess from a subset of sources. Compared to previous time-dependent searches, these analyses enable a feature to possibly find multiple flares from a single direction with an unbinned maximum-likelihood method. M87 is found to be the most significant time-dependent source of this catalog at the level of 1.7σ post-trial, and TXS 0506+056 is the only source for which two flares are reconstructed. The binomial test reports a cumulative time-dependent neutrino excess in the Northern Hemisphere at the level of 3.0σ associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068. |
Keywords: | Neutrino astronomy; High energy astrophysics; Particle astrophysics |
Rights: | © 2021. The American Astronomical Society. All rights reserved. |
DOI: | 10.3847/2041-8213/ac2c7b |
Published version: | http://dx.doi.org/10.3847/2041-8213/ac2c7b |
Appears in Collections: | Physics publications |
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