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arXiv · 2011.03773

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

Ruo-Yu Liu·Shao-Qiang Xi·Xiang-Yu Wang
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Abstract

Recently, a high-energy muon neutrino event was detected in association with a tidal disruption event (TDE) AT2019dsg at the time about 150 days after the peak of the optical/UV luminosity. We propose that such a association could be interpreted as arising from hadronic interactions between relativistic protons accelerated in the jet launched from the TDE and the intense radiation field of TDE inside the optical/UV photosphere, if we are observing the jet at a moderate 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 line of sight which provides a high opacity for the photoionization and the Bethe-Heitler process, {and allows the existence of an intrinsic long-term X-ray radiation of comparatively high emissivity}. As a result, the cascade emission accompanying the neutrino production, which would otherwise overshoot the flux limits in X-ray and/or GeV band, is significantly obscured or absorbed. Since the jets of TDEs are supposed to be randomly oriented in the sky, the source density rate of TDE with an off-axis jet is significantly higher than that of TDE with an on-axis jet. Therefore, an off-axis jet is naturally expected in a nearby TDE being discovered, supporting the proposed scenario.

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Ruo-Yu Liu, Shao-Qiang Xi, Xiang-Yu Wang. 2020-11-07. Neutrino Emission from an Off-Axis Jet Driven by the Tidal Disruption Event AT2019dsg. https://doi.org/10.1103/physrevd.102.083028

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