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We analyze both the early and late time radio and X-ray data of the tidaldisruption event Swift J1644+57. The data at early times ($\lesssim 5$ days)necessitates separation of the radio and X-ray emission regions, eitherspatially or in velocity space. This leads us to suggest a two component jetmodel, in which the inner jet is initially relativistic with Lorentz factor$\Gamma \approx 15$, while the outer jet is trans-relativistic, with $\Gamma\lesssim 1.2$. This model enables a self-consistent interpretation of the latetime radio data, both in terms of peak frequency and flux. We solve thedynamics, radiative cooling and expected radiation from both jet components. Weshow that while during the first month synchrotron emission from the outer jetdominates the radio emission, at later times radiation from ambient gascollected by the inner jet dominates. This provides a natural explanation tothe observed re-brightening, without the need for late time inner engineactivity. After 100 days, the radio emission peak is in the optically thickregime, leading to a decay of both the flux and peak frequency at later times.Our model's predictions for the evolution of radio emission in jetted tidaldisruption events can be tested by future observations.

A two-component jet model for the tidal disruption event Swift J164449.3+573451