# Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events

## TL;DR

This paper reports on a seven-year search for astrophysical neutrino sources using IceCube cascade events, improving sensitivity and angular resolution, but finding no significant sources, thus setting new constraints in neutrino astronomy.

## Contribution

The study extends previous work by adding five years of data, enhancing angular resolution, and testing for Galactic emission, making it the most sensitive cascade analysis to date.

## Key findings

- No significant neutrino source clustering detected.
- Constraints on astrophysical neutrino sources are the most stringent to date.
- Analysis demonstrates improved sensitivity over previous IceCube cascade studies.

## Abstract

Low background searches for astrophysical neutrino sources anywhere in the sky can be performed using cascade events induced by neutrinos of all flavors interacting in IceCube with energies as low as ~1 TeV. Previously, we showed that even with just two years of data, the resulting sensitivity to sources in the southern sky is competitive with IceCube and ANTARES analyses using muon tracks induced by charge current muon neutrino interactions - especially if the neutrino emission follows a soft energy spectrum or originates from an extended angular region. Here, we extend that work by adding five more years of data, significantly improving the cascade angular resolution, and including tests for point-like or diffuse Galactic emission to which this dataset is particularly well-suited. For many of the signal candidates considered, this analysis is the most sensitive of any experiment. No significant clustering was observed, and thus many of the resulting constraints are the most stringent to date. In this paper we will describe the improvements introduced in this analysis and discuss our results in the context of other recent work in neutrino astronomy.