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The Tidal Disruption Event (TDE) AT 2018hyz exhibited a delayed radio flarealmost three years after the stellar disruption. Here we report new radioobservations of the TDE AT 2018hyz with the AMI-LA and ATCA spanning from amonth to more than four years after the optical discovery and 200 days sincethe last reported radio observation. We detected no radio detection from 30-220days after the optical discovery in our observations at 15.5 GHz down to a$3\sigma$ level of < 0.14 mJy. The fast-rising, delayed, radio flare isobserved in our radio data set and continues to rise almost ~1580 days afterthe optical discovery. We find that the delayed radio emission, first detected$972$ days after optical discovery, evolves as $t^{4.2 \pm 0.9}$, at 15.5 GHz.Here, we present an off-axis jet model that can explain the full set of radioobservations. In the context of this model, we require a powerful narrow jetwith an isotropic equivalent kinetic energy $E_{\rm k,iso} \sim 10^{55}$ erg,an opening angle of $ \rm \sim 7^{\circ}$, and a relatively large viewing angleof $ \rm \sim 42^{\circ}$, launched at the time of the stellar disruption.Within our framework, we find that the minimal collimated energy possible foran off-axis jet from AT 2018hyz is $E_k \geq 3 \times 10^{52}$ erg. Finally, weprovide predictions based on our model for the light curve turnover time, andfor the proper motion of the radio emitting source.

An off-axis relativistic jet seen in the long lasting delayed radio flare of the TDE AT 2018hyz