Beginning a journey across the universe: the discovery of extragalactic neutrino factories

Abstract

Neutrinos are the most elusive particles in the Universe, capable of traveling nearly unimpeded across it. Despite the vast amount of data collected, a long standing and unsolved issue is still the association of high-energy neutrinos with the astrophysical sources that originate them. Amongst the candidate sources of neutrinos there are blazars, a class of extragalactic sources powered by supermassive black holes that feed highly relativistic jets, pointed towards the Earth. Previous studies appear controversial, with several efforts claiming a tentative link between high-energy neutrino events and individual blazars, and others putting into question such relation. In this work we show that blazars are unambiguously associated with high-energy astrophysical neutrinos at unprecedented level of confidence, i.e. chance probability of 6 x 10^{-7}. Our statistical analysis provides the observational evidence that blazars are astrophysical neutrino factories and hence, extragalactic cosmic-ray accelerators.

Published in ApJL

References in corpus (19)

• Active Galactic Nuclei: what's in a name?
• IceCube-Gen2: The Window to the Extreme Universe
• Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• All-sky search for time-integrated neutrino emission from astrophysical sources with 7 years of IceCube data
• The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux
• The Pacific Ocean Neutrino Experiment
• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Detection of a particle shower at the Glashow resonance with IceCube
• Design and Sensitivity of the Radio Neutrino Observatory in Greenland (RNO-G)
• Directional association of TeV to PeV astrophysical neutrinos with radio blazars
• Astrophysical Sources of High Energy Neutrinos in the IceCube Era
• Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories
• Search for High-Energy Neutrino Emission from Radio-Bright AGN
• Discovery of the Ultra-high energy gamma-ray source LHAASO J2108+5157
• Gamma rays from Fast Black-Hole Winds
• Revisiting AGN as the Source of IceCube's Diffuse Neutrino Flux
• Blazar -- IceCube neutrino association revisited

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• Correlating high-energy IceCube neutrinos with 5BZCAT blazars and RFC sources
• High-energy neutrino-induced cascade from the direction of the flaring radio blazar TXS 0506+056 observed by Baikal-GVD in 2021
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• Flare Duty Cycle of Gamma-Ray Blazars and Implications for High-Energy Neutrino Emission
• A Cross-correlation Study between IceCube Neutrino Events and the Fermi Unresolved Gamma-ray Sky
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• Probing the connection between IceCube neutrinos and MOJAVE AGN
• Repeated pattern of $\gamma$-ray flares in the blazar PKS 1502+106 coincident with the IC190730A neutrino event
• Multi-epoch leptohadronic modeling of neutrino source candidate blazar PKS 0735+178
• $Fermi$-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
• Neutrino production in blazar radio cores
• Multi-messenger emission from magnetic reconnection in blazar jets: the case of TXS 0506+056
• Hard X-ray emission from blazars associated with high-energy neutrinos
• Assessing coincident neutrino detections using population models
• A hierarchical Bayesian approach to point source analysis in high-energy neutrino telescopes
• Extreme Jet Beaming Observed in Neutrino-Associated Blazars
• Investigating the correlations between IceCube high-energy neutrinos and Fermi-LAT $\gamma$-ray observations. II
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• Diffuse astrophysical neutrinos from dark matter around blazars
• X-ray Spectral Variability as Probe of Multimessenger Emission in Blazar 5BZB J0630-24064
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• The physical properties of candidate neutrino-emitter blazars
• Optimizing the hunt for extraterrestrial high-energy neutrino counterparts
• Impact of multi-messenger spectral modelling on blazar-neutrino associations
• Rapid jet ejection from PKS 0215+015 coincident with a high-energy neutrino event
• Neutrinos from extreme astrophysical sources
• An isotropic full-sky sample of optically selected blazars
• Neutrino Astronomy at High Energies - An Experimental Review
• Hadronic origin of gamma rays and neutrinos from blazars: Multi-messenger implications and observational constraints