Searching for High-Energy Neutrino Emission from Seyfert Galaxies in the Northern Sky with IceCube

TL;DR

This study searches for high-energy neutrino emissions from Seyfert galaxies in the Northern Sky using IceCube data, finding potential signals from two sources and constraining overall neutrino contributions.

Contribution

It presents the first search for neutrino signals from multiple Seyfert galaxies with IceCube, testing both generic and model-predicted spectra, and reports potential associations with two sources.

Findings

Potential neutrino excesses from NGC 4151 and CGCG 420-015 at 2.7σ significance

Constraints on the collective neutrino emission from the studied Seyfert galaxies

Implications for neutrino production models in AGN cores

Abstract

The recent detection of TeV neutrino emission from the nearby active galaxy NGC 1068 by IceCube suggests that AGN could make a sizable contribution to the total high-energy cosmic neutrino flux. The absence of TeV gamma rays from NGC 1068, indicates neutrino production originates in the innermost region of the AGN. Disk-corona models predict a correlation between neutrinos and keV X-rays in Seyfert galaxies, a subclass of AGN to which NGC 1068 belongs. Using 10 years of IceCube through-going track events, we report results from searches for neutrino signals from 27 additional sources in the Northern Sky by studying both the generic single power-law spectral assumption and spectra predicted by the disk-corona model. Our results show excesses of neutrinos associated with two sources, NGC 4151 and CGCG 420-015, at 2.7$\sigma$ significance, and at the same time constrain the collective neutrino emission from our source list.