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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.citation	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.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.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	journal article	es_ES
dc.date.updated	2015-04-29T09:10:04Z
dc.identifier.doi	10.1051/0004-6361/201525670
dc.identifier.idgrec	102359
dc.rights.accessRights	open access	es_ES