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EP: Fachverband Extraterrestrische Physik

EP 7: Astrophysics

EP 7.8: Talk

Wednesday, March 23, 2022, 18:00–18:15, EP-H1

The candidate tidal disruption event AT2019fdr coincident with a high-energy neutrino — •Simeon Reusch — Deutsches Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany — Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany

The origins of the high-energy cosmic neutrino flux remain largely unknown. Last year, a high-energy neutrino was associated with the tidal disruption event (TDE) AT2019dsg.

In this talk we present AT2019fdr, an exceptionally luminous TDE candidate, coincident with another high-energy neutrino detected by IceCube. We will present observations that further support a TDE origin of this flare. These include a bright dust echo and soft late-time X-ray emission. The probability of finding two such bright events in neutrino follow-up by chance is just 0.034%.

Furthermore, we have evaluated several models for neutrino production and show that AT2019fdr is capable of producing the observed high-energy neutrino. This reinforces the case for TDEs as neutrino sources.