ANTARES constrains a blazar origin of two IceCube PeV neutrino events
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ANTARES constrains a blazar origin of two IceCube PeV neutrino events

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ANTARES constrains a blazar origin of two IceCube PeV neutrino events

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dc.contributor.author ANTARES Collaboration
dc.contributor.author Barrios Martí, Javier
dc.contributor.author Gómez González, Juan Pablo
dc.contributor.author Hernández Rey, Juan José
dc.contributor.author Mangano, Salvatore
dc.contributor.author Ros Ibarra, Eduardo
dc.contributor.author Sánchez Losa, Agustín
dc.contributor.author Yepes Ramírez, Harold
dc.contributor.author Zornoza Gómez, Juan de Dios
dc.contributor.author Zúñiga Román, Juan
dc.contributor.author Adrián Martínez, S.
dc.contributor.author Ardid Ramírez, Miguel
dc.contributor.author Bou Cabo, Manuel
dc.contributor.author Dornic, Damien
dc.contributor.author Lambard, Guillaume
dc.contributor.author Martínez Mora, Juan A.
dc.contributor.author TANAMI Collaboration
dc.date.accessioned 2015-04-29T09:10:03Z
dc.date.available 2015-04-29T09:10:03Z
dc.date.issued 2015
dc.identifier.uri http://hdl.handle.net/10550/43512
dc.description.abstract Context. The source(s) of the neutrino excess reported by the IceCube Collaboration is unknown. The TANAMI Collaboration recently reported on the multiwavelength emission of six bright, variable blazars which are positionally coincident with two of the most energetic IceCube events. Objects like these are prime candidates to be the source of the highest-energy cosmic rays, and thus of associated neutrino emission. Aims. We present an analysis of neutrino emission from the six blazars using observations with the ANTARES neutrino telescope. Methods. The standard methods of the ANTARES candidate list search are applied to six years of data to search for an excess of muons ¿ and hence their neutrino progenitors ¿ from the directions of the six blazars described by the TANAMI Collaboration, and which are possibly associated with two IceCube events. Monte Carlo simulations of the detector response to both signal and background particle fluxes are used to estimate the sensitivity of this analysis for different possible source neutrino spectra. A maximum-likelihood approach, using the reconstructed energies and arrival directions of through-going muons, is used to identify events with properties consistent with a blazar origin. Results. Both blazars predicted to be the most neutrino-bright in the TANAMI sample (1653−329 and 1714−336) have a signal flux fitted by the likelihood analysis corresponding to approximately one event. This observation is consistent with the blazar-origin hypothesis of the IceCube event IC 14 for a broad range of blazar spectra, although an atmospheric origin cannot be excluded. No ANTARES events are observed from any of the other four blazars, including the three associated with IceCube event IC20. This excludes at a 90% confidence level the possibility that this event was produced by these blazars unless the neutrino spectrum is flatter than −2.4.
dc.relation.ispartof Astronomy and Astrophysics, 2015, vol. 576, num. L8, p. 1-6
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source ANTARES Collaboration Ros Ibarra, Eduardo Gómez González, Juan Pablo Hernández Rey, Juan José Mangano, Salvatore Yepes Ramírez, Harold Zornoza Gómez, Juan de Dios Zuñiga Román, Juan Tönnis, Christoph Sánchez Losa, A. Barrios Martí, Javier 2015 ANTARES constrains a blazar origin of two IceCube PeV neutrino events Astronomy and Astrophysics 576 L8 1 6
dc.subject Física nuclear
dc.subject Col·lisions (Física nuclear)
dc.subject Física
dc.title ANTARES constrains a blazar origin of two IceCube PeV neutrino events
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-04-29T09:10:04Z
dc.identifier.doi http://dx.doi.org/10.1051/0004-6361/201525670
dc.identifier.idgrec 102359

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