Electromagnetic Cascade Emission from Neutrino-Coincident Tidal Disruption Events

Abstract

The potential association between Tidal Disruption Events (TDEs) and high-energy astrophysical neutrinos implies the acceleration of cosmic rays. These accelerated particles will initiate electromagnetic (EM) cascades spanning from keV to GeV energies by the processes related to neutrino production. We model the EM cascade and neutrino emissions by numerically solving the time-dependent transport equations and discuss the implications for AT2019dsg and AT2019fdr in the X-ray and $\gamma$-ray bands. We show that the $\gamma$-ray constraints from \emph{Fermi} can constrain the size of the radiation zone and the maximum energy of injected protons, and that the corresponding expected neutrino event numbers in follow-up searches are limited to be less than about 0.1. Depending on the efficiency of $p\gamma$ interactions, the X-ray and $\gamma$-ray signals can be expected closer to the peak of the optical-ultraviolet (OUV) luminosity, or to the time of the neutrino production.

18 pages, 7 figures, 1 table. Revised version. Accepted for publication in ApJ

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Cited by in corpus (7)

• AM${}^3$: An Open-Source Tool for Time-Dependent Lepto-Hadronic Modeling of Astrophysical Sources
• AT2021lwx: Another Neutrino-Coincident Tidal Disruption Event with a Strong Dust Echo?
• Tidal Disruption Events and Dark Matter Scatterings with Neutrinos and Photons
• Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc
• Testing unified models for the origin of ultrahigh-energy cosmic rays and neutrinos: Multimessenger approaches with x-ray observations
• An Accretion Flare Interpretation for the Ultra-High-Energy Neutrino Event KM3-230213A
• TeV Gamma-Rays from the Low-Luminosity Active Galactic Nucleus NGC 4278: Implications for the Diffuse Neutrino Background