Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources - INSPIRE

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Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources

IceCube

Collaboration

Sep 13, 2021

25 pages

Published in:

Astrophys.J.Lett. 920 (2021) 2, L45

Published: Oct 22, 2021

e-Print:

2109.05818 [astro-ph.HE]

DOI:

10.3847/2041-8213/ac2c7b

Experiments:

ICECUBE

View in:

ADS Abstract Service

reference search33 citations

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Abstract: (IOP)

A recent time-integrated analysis of a catalog of 110 candidate neutrino sources revealed a cumulative neutrino excess in the data collected by IceCube between 2008 April 6 and 2018 July 10. This excess, inconsistent with the background hypothesis in the Northern Hemisphere at the 3.3σ level, is associated with four sources: NGC 1068, TXS 0506+056, PKS 1424+240, and GB6 J1542+6129. This Letter presents two time-dependent neutrino emission searches on the same data sample and catalog: a point-source search that looks for the most significant time-dependent source of the catalog by combining space, energy, and time information of the events, and a population test based on binomial statistics that looks for a cumulative time-dependent neutrino excess from a subset of sources. Compared to previous time-dependent searches, these analyses enable a feature to possibly find multiple flares from a single direction with an unbinned maximum-likelihood method. M87 is found to be the most significant time-dependent source of this catalog at the level of 1.7σ post-trial, and TXS 0506+056 is the only source for which two flares are reconstructed. The binomial test reports a cumulative time-dependent neutrino excess in the Northern Hemisphere at the level of 3.0σ associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068.

neutrino: particle source
time dependence
IceCube
statistics
background

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