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Recently, a high-energy muon neutrino event was detected in association witha tidal disruption event (TDE) AT2019dsg at the time about 150 days after thepeak of the optical/UV luminosity. We propose that such a association could beinterpreted as arising from hadronic interactions between relativistic protonsaccelerated in the jet launched from the TDE and the intense radiation field ofTDE inside the optical/UV photosphere, if we are observing the jet at amoderate angle (i.e., approximately 10-30 degree) with respect to the jet axis.Such an off-axis viewing angle leads to a high gas column density in the lineof sight which provides a high opacity for the photoionization and theBethe-Heitler process, {and allows the existence of an intrinsic long-termX-ray radiation of comparatively high emissivity}. As a result, the cascadeemission accompanying the neutrino production, which would otherwise overshootthe flux limits in X-ray and/or GeV band, is significantly obscured orabsorbed. Since the jets of TDEs are supposed to be randomly oriented in thesky, the source density rate of TDE with an off-axis jet is significantlyhigher than that of TDE with an on-axis jet. Therefore, an off-axis jet isnaturally expected in a nearby TDE being discovered, supporting the proposedscenario.

Neutrino Emission from an Off-Axis Jet Driven by the Tidal Disruption Event AT2019dsg