Little Red Dots as Hidden Neutrino Sources

Abstract

Little Red Dots (LRDs) are enigmatic, compact, red galaxies at high redshift, $z\sim 4$-$7$, discovered by the James Webb Space Telescope. Broad emission lines in the absence of X-ray and radio counterparts suggest that they host accreting supermassive black holes embedded in dense gaseous envelopes. This black-hole-envelope configuration facilitates efficient photohadronic interactions and neutrino production. Remarkably, their observed source number density and luminosity are compatible with the energetics of the diffuse neutrino background. We consider that relativistic jets and outflows are launched from the black hole and propagate through low-density polar funnels within envelopes, where particle acceleration and neutrino emission occur. This leads to LRDs being effectively hidden sources. Our analytic and numerical calculations show that, in an optimistic scenario, LRDs can contribute $\sim 30\%$ of the observed diffuse background at TeV$-$sub-PeV energies, predominantly through photomeson production. At high neutrino energies, $\gtrsim 10^{5.5}\mathrm{GeV}$, inverse-Compton cooling of muons modifies the resulting flavor ratio, providing a distinctive diagnostic for IceCube-Gen2 and other upcoming neutrino telescopes.

19 pages, 7 figures, 1 table

References in corpus (84)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• On the Fate of Gas Accreting at a Low Rate onto a Black Hole
• Efficient Generation of Jets from Magnetically Arrested Accretion on a Rapidly Spinning Black Hole
• Letter of Intent for KM3NeT 2.0
• High Energy Neutrinos from Astrophysical Sources: An Upper Bound
• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• General Relativistic Magnetohydrodynamic Simulations of Jet Formation and Large-Scale Propagation from Black Hole Accretion Systems
• Neutrino Interactions at Ultrahigh Energies
• IceCube-Gen2: The Window to the Extreme Universe
• Simulations of Ion Acceleration at Non-relativistic Shocks. I. Acceleration Efficiency
• Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data
• The power of blazar jets
• Super-critical Accretion Flows around Black Holes: Two-dimensional, Radiation-pressure-dominated Disks with Photon-trapping
• Convection-Dominated Accretion Flows
• Self-Similar Accretion Flows with Convection
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• The Maximum Energy of Accelerated Particles in Relativistic Collisionless Shocks
• The IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
• Testing the Hadronuclear Origin of PeV Neutrinos Observed with IceCube
• Global Structure of Three Distinct Accretion Flows and Outflows around Black Holes through Two-Dimensional Radiation-Magnetohydrodynamic Simulations
• The propagation of relativistic jets in external media
• Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
• The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
• Numerical simulations of super-critical black hole accretion flows in general relativity
• Diffuse Neutrino Intensity from the Inner Jets of Active Galactic Nuclei: Impacts of External Photon Fields and the Blazar Sequence
• Particle Acceleration in Relativistic Magnetized Collisionless Pair Shocks: Dependence of Shock Acceleration on Magnetic Obliquity
• TeV-PeV Neutrinos from Low-Power Gamma-Ray Burst Jets inside Stars
• Optical Appearance of the Debris of a Star Disrupted by a Massive Black Hole
• Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
• Hyper-Eddington accretion flows onto massive black holes
• Constraining High-Energy Cosmic Neutrino Sources: Implications and Prospects
• Supernova Hosts for Gamma-Ray Burst Jets: Dynamical Constraints
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6
• The Origin of the Extragalactic Gamma-Ray Background and Implications for Dark-Matter Annihilation
• Flavoring Astrophysical Neutrinos: Flavor Ratios Depend on Energy
• The Pacific Ocean Neutrino Experiment
• Hidden Cores of Active Galactic Nuclei as the Origin of Medium-Energy Neutrinos: Critical Tests with the MeV Gamma-Ray Connection
• Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S
• Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo
• Two Dimensional Adiabatic Flows onto a Black Hole: I. Fluid Accretion
• Calculation of High Energy Neutrino-Nucleon Cross Sections and Uncertainties Using the MSTW Parton Distribution Functions and Implications for Future Experiments
• Collapsar Jets, Bubbles and Fe Lines
• Opening Angles of Collapsar Jets
• Evidence against star-forming galaxies as the dominant source of IceCube neutrinos
• Pinpointing Extragalactic Neutrino Sources in Light of Recent IceCube Observations
• Simulations of Ion Acceleration at Non-relativistic Shocks. III. Particle Diffusion
• Measurement of the Extragalactic Background Light using MAGIC and Fermi-LAT gamma-ray observations of blazars up to z = 1
• The Faint End of the z=5 Quasar Luminosity Function from the CFHTLS
• High-Energy Neutrino and Gamma-Ray Emission from Tidal Disruption Events
• High-Energy Neutrino Flares From X-Ray Bright and Dark Tidal Disruptions Events
• JADES -- The Rosetta Stone of JWST-discovered AGN: deciphering the intriguing nature of early AGN
• Radiation Magneto-hydrodynamic Simulations of the Formation of Hot Accretion Disk Coronae
• The Faint End of the Quasar Luminosity Function at $z\sim 5$ from the Subaru Hyper Suprime-Cam Survey
• Physics of radiation mediated shocks and its applications to GRBs, supernovae, and neutron star mergers
• The prototyping/early construction phase of the BAIKAL-GVD project
• Characterization of the Astrophysical Diffuse Neutrino Flux using Starting Track Events in IceCube
• Quasar Luminosity Function at z = 7
• Relativistic Photon Mediated Shocks
• Little Red Dots: Rapidly Growing Black Holes Reddened by Extended Dusty Flows
• Cosmic infrared background excess from axion-like particles and implications for multi-messenger observations of blazars
• Photon-conserving Comptonization in simulations of accretion disks around black holes
• Systematic two-dimensional radiation hydrodynamic simulations of super-Eddington accretion flow and outflow: Comparison with the slim disk model
• Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos
• Complementarity of Stacking and Multiplet Constraints on the Blazar Contribution to the Cumulative High-Energy Neutrino Intensity
• Deep silence: radio properties of little red dots
• Revisiting the Contributions of Supernova and Hypernova Remnants to the Diffuse High-Energy Backgrounds: Constraints on Very-High-Redshift Injections
• No [CII] or dust detection in two Little Red Dots at z${}_{\mathrm{spec}}$ > 7
• High Energy neutrino signals from the Epoch of Reionization
• Gamma Ray Bursts from the First Stars: Neutrino Signals
• Upscattered Cocoon Emission in Short Gamma-ray Bursts as High-energy Gamma-ray Counterparts to Gravitational Waves
• UHE neutrinos from Pop III stars: concept and constraints
• Another piece to the puzzle: radio detection of a JWST detected AGN candidate
• The radio properties of the JWST-discovered AGN
• Cosmic Outliers: Low-Spin Halos Explain the Abundance, Compactness, and Redshift Evolution of the Little Red Dots
• Nuclear and electromagnetic cascades induced by ultrahigh-energy cosmic rays in radio galaxies: implications for Centaurus A
• The Energy Budget in the Jet of High-frequency Peaked BL Lacertae Objects
• High-energy neutrino deep inelastic scattering cross sections
• Lonely Little Red Dots: Challenges to the AGN-nature of little red dots through their clustering and spectral energy distributions
• Neutrino Flavor Ratios Modified by Cosmic Ray Secondary Acceleration
• Active galactic nuclei-heated dust revealed in "little red dots"
• High-energy neutrino emission associated with gravitational-wave signals: effects of cocoon photons and constraints on late-time emission
• A Black-Hole Envelope Interpretation for Cosmological Demographics of Little Red Dots
• Quasi-star jets as unidentified gamma-ray sources
• Multi-messenger signatures of delayed choked jets in tidal disruption events