Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Neutrino Astronomy I

T 10.4: Talk

Monday, March 31, 2025, 17:30–17:45, VG 1.105

Investigating the connection of blazars to IceCube alert events with public data — •Julian Kuhlmann and Francesca Capel — Max-Planck-Institut für Physik, Garching, DE

The IceCube collaboration has recently found evidence for neutrino emission from TXS 0506+056. Different mechanisms in various emission regions have been invoked to explain the combined neutrino and multi-wavelength observations. Motivated by spatial associations of IceCube alert events with blazars, such as TXS 0506+056, we analyse a sample of similar blazars for neutrino emission, using a Bayesian hierarchical analysis framework. Utilising the framework's capability of handling many free parameters we go beyond power-laws and employ neutrino spectra typical of proton-gamma interactions. We further use priors on spectral parameters informed by lepto-hadronic modelling of multi-wavelength observations. Among the sample blazars, three sources stand out with considerable association probabilities to neutrino events. Unaccounted for systematics in event reconstruction, as well as limited simultaneous multi-wavelength data currently pose the largest restrictions on firmly identifying the sources of high-energy alert events.

Keywords: high-energy neutrinos; Bayesian statistics; neutrino astronomy; AGN