Constraints on Neutrino Emission from Nearby Galaxies Using the 2MASS Redshift Survey and IceCube

TL;DR

This study searches for directional correlations between IceCube neutrino data and galaxy distributions from the 2MASS Redshift Survey, setting constraints on local universe neutrino fluxes and source densities, but finds no significant correlations.

Contribution

It introduces two novel correlation analyses between neutrino data and galaxy distributions to constrain local universe neutrino sources and fluxes.

Findings

No significant correlations found in either analysis.

Constraints established on neutrino flux from UHECR interactions.

Limits set on low-luminosity neutrino sources in the local universe.

Abstract

The distribution of galaxies within the local universe is characterized by anisotropic features. Observatories searching for the production sites of astrophysical neutrinos can take advantage of these features to establish directional correlations between a neutrino dataset and overdensities in the galaxy distribution in the sky. The results of two correlation searches between a seven-year time-integrated neutrino dataset from the IceCube Neutrino Observatory, and the 2MASS Redshift Survey (2MRS) catalog are presented here. The first analysis searches for neutrinos produced via interactions between diffuse intergalactic Ultra-High Energy Cosmic Rays (UHECRs) and the matter contained within galaxies. The second analysis searches for low-luminosity sources within the local universe, which would produce subthreshold multiplets in the IceCube dataset that directionally correlate with galaxy distribution. No significant correlations were observed in either analyses. Constraints are presented on the flux of neutrinos originating within the local universe through diffuse intergalactic UHECR interactions, as well as on the density of standard candle sources of neutrinos at low luminosities.