Years Delayed Gamma-ray and Radio Afterglows Originated from TDE
  Wind-Torus Interactions
  Tidal disruption events (TDEs) that occur in active galactic nuclei (AGN)
with dusty tori are a special class of sources. TDEs can generate ultrafast and
large opening-angle wind, which will almost inevitably collide with the
preexisting AGN dusty tori a few years later after the TDE outburst. The
wind-torus interactions drive two kinds of shocks: the bow shocks at the
windward side of the torus clouds, and the cloud shocks inside the torus
clouds. In a previous work, we proved that the shocked clouds will give rise to
considerable X-ray emissions which can reach $10^{41-42}$ erg s$^{-1}$ (so
called \emph{years delayed X-ray afterglows}). In this work, we focus on the
radiations of high energy particles accelerated at both shocks. Benefitting
from the strong radiation field at the inner edge of the torus, the inverse
Compton scatterings of AGN photons by relativistic electrons at bow shocks
dominate the overall gamma-ray radiation. The gamma-ray luminosity can reach
$10^{41}~{\rm erg s^{-1}} (L_{\rm kin}/10^{45}{\rm erg s^{-1}})$, where $L_{\rm
kin}$ is the kinetic luminosity of TDE wind. Synchrotron radiation at bow
shocks contributes to the radio afterglow with a luminosity of 10$^{38-39}
~{\rm erg s^{-1}} (L_{\rm kin}/10^{45}{\rm erg s^{-1}})$ at 1-10 GHz if the
magnetic field is 100 mGauss, and extends to infrared with a luminosity of
$\sim 10^{39-40}~{\rm erg s^{-1}} (L_{\rm kin}/10^{45}{\rm erg s^{-1}})$. Our
scenario provides a prediction of the years delayed afterglows in multiple
wavebands for TDEs and reveals their connections.
