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Author  |
Bruni, G.; Bassani, L.; Alves Garre, S.; Molina, M.; Malizia, A.; Fiocchi, M.; Rodi, J.; Kouchner, A.; Coleiro, A.; Aublin, J.; Illuminati, G.; Panessa, F.; Bazzano, A.; Natalucci, L.; Ubertini, P. |
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Title |
3C 403: a candidate neutrino-emitting radio galaxy |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of Cosmology and Astroparticle Physics |
Abbreviated Journal |
J. Cosmol. Astropart. Phys. |
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Volume |
05 |
Issue |
5 |
Pages |
007 - 20pp |
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Keywords |
active galactic nuclei; neutrino astronomy; X-rays; accretion |
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Abstract |
3C 403 is a well-known FRII radio galaxy with jets extending up to kiloparsec scales. We report its identification as the second most significant candidate among more than 150 sources examined using the 15-year neutrino dataset from the ANTARES collaboration, making it one of the most promising radio-galaxy candidates for high-energy neutrino emission. Motivated by previous associations between blazars and neutrino events, we investigated the jet properties of 3C 403 and their possible role in neutrino production. Multi-scale radio observations, from parsec to kiloparsec scales, reveal a stable, twosided jet lying close to the plane of the sky, with no evidence of strong Doppler boosting, while X-ray data indicate a dominant, heavily absorbed accretion-related component. We also examined the recently proposed correlation between neutrino and hard X-ray fluxes – originally identified in blazars and Seyfert galaxies – and find that 3C 403 occupies an intermediate location in the L nu-LhX plane between jet-dominated and corona-dominated systems. However, the current upper limit on its neutrino flux prevents a firm assessment of whether it follows the proposed relation. With radiatively efficient accretion (lambda Edd similar to 10-2), strong hard X-ray emission, and a powerful but misaligned jet, 3C 403 provides a physically motivated laboratory for exploring the interplay between coronal activity and jet environments in multimessenger scenarios of neutrino production in active galaxies. |
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Address |
[Bruni, Gabriele; Fiocchi, Mariateresa; Rodi, James; Panessa, Francesca; Bazzano, Angela; Natalucci, Lorenzo; Ubertini, Pietro] INAF Ist Astrofis & Planetol Spaziali Roma, Via Fosso Cavaliere 100, I-00133 Rome, Italy, Email: gabriele.bruni@inaf.it; |
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Publisher |
IOP Publishing Ltd |
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Language |
English |
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Series Volume |
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ISSN |
1475-7516 |
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Notes |
WOS:001762363600005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7232 |
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