Abstract
The IceCube neutrino observatory is a 1 km3 detector for Cherenkov light in the ice at the South Pole. Although the presence of a diffuse astrophysical neutrino flux has been confirmed, its origin has yet to be resolved. Given the current constraints on continuous point source searches, transient and variable objects emerge as promising, detectable source candidates. IceCube boosts the sensitivity to these types of sources by alerting third-party observatories of neutrino events clustered in direction and time. This paper will showcase several neutrino-triggered multi-messenger programs in IceCube along with their results and prospects.
Highlights
Understanding the origin of cosmic rays has been a long standing goal in astrophysics
Given the current constraints on continuous point source searches, transient and variable objects emerge as promising, detectable source candidates
Two follow-up programs are currently in operation. Their respective event selection and clustering analysis was run at the South Pole and only the most significant clusters triggering an alert were sent to the North through a low-latency satellite link
Summary
Understanding the origin of cosmic rays has been a long standing goal in astrophysics. Multimessenger observations, here using neutrinos and cosmic rays, can provide a viable tool in locating and understanding cosmic acceleration sites. Hadronic interactions producing cosmic rays can produce high-energetic neutrinos [1], which reach earth unabsorbed and undeflected and whose arrival directions point back to their origin likely coinciding with the sources of cosmic rays. Using them as a trigger for optical, gamma-ray and X-ray telescopes can yield more observations in e.g. gamma rays and correlated neutrinos.
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