Speaker
Description
IceCube has been detecting cosmic high-energy neutrinos for more than 10 years, but their sources are still unknown. Transient objects, such as peculiar supernovae and tidal disruption events are proposed as efficient neutrino emitters. To identify these transients as neutrino sources, IceCube is issuing neutrino alerts, which enable us to perform electromagnetic follow-up observations. In this talk, we present our optical follow-up observations to a well-localized neutrino event, IceCube 230724A, with Subaru/HST. We construct a dedicated analysis method adopting the blind analysis policy to identify or disfavor tidal disruption events (TDEs) as cosmic neutrino sources. No TDE is found in our follow-up data set with Subaru, but future analysis with Rubin/LSST will constrain their fractional contribution to the cosmic high-energy neutrino background.
