Echoes of the past: ultra-high energy cosmic rays accelerated by radio galaxies, scattered by starburst galaxies

We suggest that the hotspot of ultrahigh energy cosmic rays (UHECR) detected by the Telescope Array (TA) from the direction of M82 might be the echo of UHECR emitted by Centaurus A in a more powerful phase approximately 20Myr ago. Echoes from other starburst galaxies may contribute to the UHECR flux at the Earth.