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.

arXiv commentPublished in ApJL

References in corpus (60)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
• Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data
• Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
• Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert
• Letter of Intent for KM3NeT 2.0
• The Second Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• 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
• Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
• Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube
• Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
• All-sky search for time-integrated neutrino emission from astrophysical sources with 7 years of IceCube data
• Diffuse Neutrino Intensity from the Inner Jets of Active Galactic Nuclei: Impacts of External Photon Fields and the Blazar Sequence
• A Multimessenger Picture of the Flaring Blazar TXS 0506+056: implications for High-Energy Neutrino Emission and Cosmic Ray Acceleration
• The Giant Radio Array for Neutrino Detection (GRAND): Science and Design
• The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux
• Coincidence of a high-fluence blazar outburst with a PeV-energy neutrino event
• Spectroscopy of The Largest Ever Gamma-ray Selected BL Lac Sample
• Blazars as Ultra-High-Energy Cosmic-Ray Sources: Implications for TeV Gamma-Ray Observations
• Modelling the coincident observation of a high-energy neutrino and a bright blazar flare
• The Pacific Ocean Neutrino Experiment
• Searches for Extended and Point-like Neutrino Sources with Four Years of IceCube Data
• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Dissecting the region around IceCube-170922A: the blazar TXS 0506+056 as the first cosmic neutrino source
• Blazar Flares as an Origin of High-Energy Cosmic Neutrinos?
• Detection of a particle shower at the Glashow resonance with IceCube
• The Parkes Half-Jansky Flat-Spectrum Sample
• Extreme blazars as counterparts of IceCube astrophysical neutrinos
• Ice Cube Observed PeV Neutrinos from AGN Cores
• Cascading Constraints from Neutrino Emitting Blazars: The case of TXS 0506+056
• A simplified view of blazars: the neutrino background
• Design and Sensitivity of the Radio Neutrino Observatory in Greenland (RNO-G)
• Dissecting the regions around IceCube high-energy neutrinos: growing evidence for the blazar connection
• Search for time-independent neutrino emission from astrophysical sources with 3 years of IceCube data
• Directional association of TeV to PeV astrophysical neutrinos with radio blazars
• Investigation of two Fermi-LAT gamma-ray blazars coincident with high-energy neutrinos detected by IceCube
• On the Evidence for Clustering in the Arrival Directions of AGASA's Ultrahigh Energy Cosmic Rays
• Photohadronic Origin of the TeV-PeV Neutrinos Observed in IceCube
• Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data
• 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
• Connecting blazars with ultra high energy cosmic rays and astrophysical neutrinos
• First combined search for neutrino point-sources in the Southern Hemisphere with the ANTARES and IceCube neutrino telescopes
• High energy neutrino flux from individual blazar flares
• Search for High-Energy Neutrino Emission from Radio-Bright AGN
• Patterns in the multi-wavelength behavior of candidate neutrino blazars
• Interpretation of the diffuse astrophysical neutrino flux in terms of the blazar sequence
• Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array
• Discovery of the Ultra-high energy gamma-ray source LHAASO J2108+5157
• Observation of the cosmic-ray shadow of the Moon with IceCube
• Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux
• Complementarity of Stacking and Multiplet Constraints on the Blazar Contribution to the Cumulative High-Energy Neutrino Intensity
• 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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• Growing evidence for high-energy neutrinos originating in radio blazars
• Establishing accretion flares from massive black holes as a source of high-energy neutrinos
• Leptohadronic Multimessenger Modeling of 324 Gamma-Ray Blazars
• Galactic contribution to the high-energy neutrino flux found in track-like IceCube events
• MOJAVE. XX. Persistent Linear Polarization Structure in Parsec-scale AGN Jets
• 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
• BASS XXXIII: Swift-BAT blazars and their jets through cosmic time
• Search for directional associations between Baikal Gigaton Volume Detector neutrino-induced cascades and high-energy astrophysical sources
• Searches for neutrinos in the direction of radio-bright blazars with the ANTARES telescope
• The spectra of IceCube Neutrino (SIN) candidate sources -- III. Optical spectroscopy and source characterization of the full sample
• Neutrino flares of radio blazars observed from TeV to PeV
• Association of the IceCube neutrinos with blazars in the CGRaBS sample
• The origin of high-energy astrophysical neutrinos: new results and prospects
• 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
• Hadronic signatures from magnetically dominated baryon-loaded AGN jets
• 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
• Flat Spectrum Radio Quasars as high-energy neutrino sources
• Diffuse astrophysical neutrinos from dark matter around blazars
• X-ray Spectral Variability as Probe of Multimessenger Emission in Blazar 5BZB J0630-24064
• Supermassive black holes and their surroundings: MeV signatures
• 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