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 the preexisting AGN few years later after TDE outburst. The wind-torus interactions drive two kinds shocks: bow shocks at windward side torus clouds, cloud inside clouds. In previous work, we proved shocked clouds give rise to considerable X-ray emissions reach $10^{41-42}$ erg s$^{-1}$ (so called \emph{years delayed afterglows}). this focus on radiations high energy particles accelerated both shocks. Benefitting from strong radiation field inner edge torus, inverse Compton scatterings photons by relativistic electrons dominate overall gamma-ray radiation. luminosity $10^{41}~{\rm s^{-1}} (L_{\rm kin}/10^{45}{\rm s^{-1}})$, where $L_{\rm kin}$ is kinetic wind. Synchrotron contributes radio afterglow 10$^{38-39} ~{\rm s^{-1}})$ 1-10 GHz if magnetic 100 mGauss, extends infrared $\sim 10^{39-40}~{\rm s^{-1}})$. Our scenario provides prediction afterglows multiple wavebands for reveals their connections.