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Author  |
KM3NeT, Fermi-LAT and SVOM Collaborations (Adriani, O. et al); Alves Garre, S.; Bariego-Quintana, A.; Calvo, D.; Cecchini, V.; Garcia Soto, A.; Gozzini, S.R.; Hernandez-Rey, J.J.; Lazo, A.; Lessing, N.; Palacios Gonzalez, J.; Pastor Gomez, E.J.; Prado, J.; Real, D.; Saina, A.; Salesa Greus, F.; Sanchez Losa, A.; Zornoza, J.D.; Zuñiga, J. |
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Title |
Characterizing Candidate Blazar Counterparts of the Ultra-high-energy Event KM3-230213A |
Type |
Journal Article |
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Year |
2026 |
Publication |
Astronomical Journal |
Abbreviated Journal |
Astron. J. |
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Volume |
172 |
Issue |
3 |
Pages |
139 - 34pp |
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Abstract |
High-energy astrophysical neutrinos serve as crucial messengers for understanding hadronic acceleration processes and identifying the origins of cosmic rays, with blazars among the most promising neutrino sources. The KM3NeT experiment reported the detection of an ultrahigh-energy neutrino with an energy estimate of similar to 220 PeV, the most energetic yet observed. The neutrino arrival direction has a 99% confidence region of 3 degrees radius centered at R.A. 94.degrees 3, decl. -7.degrees 8 (J2000). In this work, 17 candidate blazars located within this region are identified. Comprehensive new observations and archival data analysis for these sources are presented. The study provides a complete multiwavelength coverage across radio, optical, X-ray, and gamma-ray bands, including proprietary data and dedicated follow-up observations. This study highlights flaring behavior in several candidate counterparts. One object exhibits a radio flare coinciding with the neutrino arrival time, with a pre-trial chance probability of 0.26%. Only for this object, the chance probability could be quantified in a robust way. Another candidate displays a rising trend in X-ray flux in a 1 yr window around the neutrino arrival time, while a third undergoes a gamma-ray flare during the same period. Based on the observational findings presented here, while none of these candidates can conclusively be linked to the neutrino, the implications of a possible blazar origin for the KM3NeT event are discussed. |
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Address |
[Adriani, O.; Berti, E.; Betti, P.; Bottai, S.; Mori, N.; Pacini, L.; Papini, P.; Scaringella, M.; Starodubtsev, O.; Vannuccin, E.] Ist Nazl Fis Nucl, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy, Email: alexander@plav.in; |
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Publisher |
IOP Publishing Ltd |
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Language |
English |
Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0004-6256 |
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Notes |
WOS:001848995800001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7468 |
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