3C 129 at 90 centimeters: Evidence for a radio relic?

We present a new wide-field map of the radio galaxy 3C 129 and its companion galaxy 3C 129.1 at lambda = 90 cm. We see a distinct steep-spectrum feature near the head of 3C 129, extending in a direction perpendicular to the radio tails. We propose that this Crosspiece might consist of fossil radio plasma, which has been re-energized by the compression of the bow shock of the supersonically moving galaxy 3C 129. One possible origin of the fossil radio plasma could be the tail of a nearby head-tail radio galaxy. We discuss the implications of and give testable predictions for this scenario.