We announce the first discovery of a bent double lobe radio source (DLRS) ina known cluster filament. The bent DLRS is found at a distance of 3.4 Mpc fromthe center of the rich galaxy cluster, Abell~1763. We derive a bend anglealpha=25deg, and infer that the source is most likely seen at a viewing angleof Phi=10deg. From measuring the flux in the jet between the core and furtherlobe and assuming a spectral index of 1, we calculate the minimum pressure inthe jet, (8.0+-3.2)x10^-13 dyn/cm^2, and derive constraints on theintra-filament medium (IFM) assuming the bend of the jet is due to rampressure. We constrain the IFM to be between (1-20)x10^-29 gm/cm^3. This isconsistent with recent direct probes of the IFM and theoretical models. Theseobservations justify future searches for bent double lobe radio sources locatedseveral Mpc from cluster cores, as they may be good markers of super clusterfilaments.
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