Astrophysical interpretation of small-scale neutrino angular correlation searches with IceCube

Abstract

The IceCube Neutrino Observatory has discovered a diffuse all-flavor flux of high-energy astrophysical neutrinos. However, the corresponding astrophysical sources have not yet been identified. Neither significant point sources nor significant angular correlations of event directions have been observed by IceCube or other instruments to date. We present a new method to interpret the non-observation of angular correlations in terms of exclusions on the strength and number of point-like sources in generic astrophysical scenarios. Additionally, we constrain the presence of these sources taking into account the measurement of the diffuse high-energy neutrino flux by IceCube. We apply the method to two types of astrophysically motivated source count distributions: The first type is obtained by considering the cosmological evolution of the co-moving density of active galaxies, while the second type is directly derived from the gamma ray source count distribution observed by Fermi-LAT. As a result, we constrain the possible parameter space for both types of source count distributions.

arXiv comment26 pages, 10 figures, accepted by Astroparticle Physics

References in corpus (28)

• Big-Bang Nucleosynthesis
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
• A Cosmology Calculator for the World Wide Web
• Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data
• Particle Physics with High Energy Neutrinos
• First Year Performance of The IceCube Neutrino Telescope
• A Proton Synchrotron Blazar Model for Flaring in Markarian~501
• Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube
• Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
• The Space Density of Compton Thick AGN and the X-ray Background
• High-energy neutrinos in the context of multimessenger physics
• The Cosmic Evolution of Fermi BL Lacertae Objects
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• 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
• High redshift quasars in the COSMOS survey: the space density of z>3 X-ray selected QSOs
• Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background
• Co-moving space density of X-ray-selected Active Galactic Nuclei
• Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data
• Galaxy And Mass Assembly (GAMA): The 325 MHz Radio Luminosity Function of AGN and Star Forming Galaxies
• Constraints on Extragalactic Point Source Flux from Diffuse Neutrino Limits
• Muon Acceleration in Cosmic-ray Sources
• Comoving Space Density and Obscured Fraction of High-Redshift Active Galactic Nuclei in the Subaru/{\it XMM-Newton} Deep Survey
• External Compton emission in blazars of non-linear SSC cooled electrons
• The phase diagram of ice: a quasi-harmonic study based on a flexible water model
• Astrophysical implications of high energy neutrino limits
• The jet-disk symbiosis. II. Interpreting the Radio/UV correlations in quasars

Cited by in corpus (1)

• One-point fluctuation analysis of the high-energy neutrino sky