2015A&A...576L...8A

Query : 2015A&A...576L...8A

2015A&A...576L...8A - Astronomy and Astrophysics, volume 576, L8-8 (2015/4-1)

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

ANTARES COLLABORATION, ADRIAN-MARTINEZ S., ALBERT A., ANDRE M., ANTON G., ARDID M., AUBERT J.-J., BARET B., BARRIOS J., BASA S., BERTIN V., BIAGI S., BOGAZZI C., BORMUTH R., BOU-CABO M., BOUWHUIS M.C., BRUIJN R., BRUNNER J., BUSTO J., CAPONE A., CARAMETE L., CARR J., CHIARUSI T., CIRCELLA M., CONIGLIONE R., COSTANTINI H., COYLE P., CREUSOT A., DE ROSA G., DEKEYSER I., DESCHAMPS A., DE BONIS G., DISTEFANO C., DONZAUD C., DORNIC D., DOROSTI Q., DROUHIN D., DUMAS A., EBERL T., ENZENHOEFER A., ESCOFFIER S., FEHN K., FELIS I., FERMANI P., FOLGER F., FUSCO L.A., GALATA S., GAY P., GEISSELSOEDER S., GEYER K., GIORDANO V., GLEIXNER A., GOMEZ-GONZALEZ J.P., GRACIA-RUIZ R., GRAF K., VAN HAREN H., HEIJBOER A.J., HELLO Y., HERNANDEZ-REY J.J., HERRERO A., HOESSL J., HOFESTADT J., HUGON C., JAMES C.W., DE JONG M., KALEKIN O., KATZ U., KIESSLING D., KOOIJMAN P., KOUCHNER A., KULIKOVSKIY V., LAHMANN R., LATTUADA D., LEFEVRE D., LEONORA E., LOEHNER H., LOUCATOS S., MANGANO S., MARCELIN M., MARGIOTTA A., MARTINEZ-MORA J.A., MARTINI S., MATHIEU A., MICHAEL T., MIGLIOZZI P., NEFF M., NEZRI E., PALIOSELITIS D., PAVALAS G.E., PERRINA C., PIATTELLI P., POPA V., PRADIER T., RACCA C., RICCOBENE G., RICHTER R., ROENSCH K., ROSTOVTSEV A., SALDANA M., SAMTLEBEN D.F.E., SANCHEZ-LOSA A., SANGUINETI M., SAPIENZA P., SCHMID J., SCHNABEL J., SCHULTE S., SCHUESSLER F., SEITZ T., SIEGER C., SPIES A., SPURIO M., STEIJGER J.J.M., STOLARCZYK T., TAIUTI M., TAMBURINI C., TAYALATI Y., TROVATO A., TSELENGIDOU M., TOENNIS C., VALLAGE B., VALLEE C., VAN ELEWYCK V., VISSER E., VIVOLO D., WAGNER S., DE WOLF E., YEPES H., ZORNOZA J.D., ZUNIGA J. (The TANAMI Collaboration), KRAUSS F., KADLER M., MANNHEIM K., SCHULZ R., TRUESTEDT J., WILMS J., OJHA R., ROS E., BAUMGARTNER W., BEUCHERT T., BLANCHARD J., BUERKEL C., CARPENTER B., EDWARDS P.G., EISENACHER GLAWION D., ELSAESSER D., FRITSCH U., GEHRELS N., GRAEFE C., GROSSBERGER C., HASE H., HORIUCHI S., KAPPES A., KREIKENBOHM A., KREYKENBOHM I., LANGEJAHN M., LEITER K., LITZINGER E., LOVELL J.E.J., MUELLER C., PHILLIPS C., PLOETZ C., QUICK J., STEINBRING T., STEVENS J., THOMPSON D.J. and TZIOUMIS A.K.

Abstract (from CDS):

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. We present an analysis of neutrino emission from the six blazars using observations with the ANTARES neutrino telescope. 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. 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 IC14 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.

Abstract Copyright: ∼

Journal keyword(s): neutrinos - galaxies: active - quasars: general

Simbad objects: 7

Full paper

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Number of rows : 7

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2024	#notes
1	QSO B0235-618	QSO	02 36 53.24574011	-61 36 15.1835463	18.18	18.5	17.62	~	101	1
2	QSO B0302-623	QSO	03 03 50.63135648	-62 11 25.5500344	19.48		17.87	~	147	1
3	QSO B0308-611	QSO	03 09 56.09914475	-60 58 39.0564095	19.00	18.5	18.18	~	137	1
4	2MASS J16561677-3302127	Bla	16 56 16.78	-33 02 12.7	18.4	17.8	17.5	~	79	0
5	ICRF J171736.0-334208	BLL	17 17 36.02929270	-33 42 08.8296186	20.93		17.3	~	126	1
6	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000				~	14410	0
7	ICRF J180242.6-394007	Bla	18 02 42.68005300	-39 40 07.9081646			17.3	~	109	1

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