Journal Article/Contribution to a conference proceedings

PUBDB-2026-00379

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The physical properties of candidate neutrino-emitter blazars

Azzollini, A. (Corresponding author)Extern* ; Buson, S.DESY* ; Coleiro, A. ; de Clairfontaine, G. F. (Corresponding author) ; Pfeiffer, L. ; Zaballa, J. M. S. ; Boughelilba, M.DESY* ; Lincetto, M.Extern*

2025
EDP Sciences Les Ulis

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Please use a persistent id in citations: doi:10.1051/epjconf/202531906005  doi:10.3204/PUBDB-2026-00379

Abstract: High-energy neutrinos detected by the IceCube Observatory provide a unique opportunity to study the origin of cosmic rays and the nature of the sources producing them. Among the putative birthplaces of astrophysical highenergy neutrinos, blazar jets stand out due to their capability of accelerating particles and providing intense external radiation fields. Blazars are active galactic nuclei (AGN), a class of luminous extragalactic objects powered by a central supermassive black hole, with the jets pointing in the observer’s line of sight. In this contribution, we focus on a selected sample of 52 blazars that have been proposed as candidate IceCube neutrino counterparts (post-trial statistical significance 5σ). We use multiwavelength data, both archival and proprietary, in the radio, optical, and γ-ray bands and characterize the sources’ nature and their central engine’s peculiarities. Properties such as redshift, black hole mass, accretion regime, radiation field, and jet power are crucial to investigate the properties of these blazars and the potential link with the acceleration of cosmic rays. Our study shows that these 52 neutrino-emitter blazar candidates show a mild tendency toward radiatively efficient accretion and high jet power. However, statistical tests show they are compatible with the overall population of blazars.

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Contributing Institute(s):

1. Gammaastronomie (Z_GA)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
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