• Media type: E-Article
  • Title: Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources
  • Contributor: 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. Balagopal; Barbano, A.; Barwick, S. W.; Bastian, B.; Basu, V.; Baur, S.; Bay, R.; [...]
  • imprint: American Astronomical Society, 2021
  • Published in: The Astrophysical Journal Letters
  • Language: Not determined
  • DOI: 10.3847/2041-8213/ac2c7b
  • ISSN: 2041-8205; 2041-8213
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title> <jats:p>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 3.3<jats:italic>σ</jats:italic> 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 1.7<jats:italic>σ</jats:italic> 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 3.0<jats:italic>σ</jats:italic> associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068.</jats:p>
  • Access State: Open Access