The first bent double lobe radio source in a known cluster filament: Constraints on the intrafilament medium

Abstract

We announce the first discovery of a bent double lobe radio source (DLRS) in a known cluster filament. The bent DLRS is found at a distance of 3.4Mpc from the center of the rich galaxy cluster, A1763. We derive a bend angle α =25°, and infer that the source is most likely seen at a viewing angle ofΦ=10°. Frommeasuring the flux in the jet between the core and further lobe and assuming a spectral index of 1, we calculate the minimum pressure in the jet, (8.0±3.2)×10-13 dyn cm-2, and derive constraints on the intrafilament medium (IFM) assuming the bend of the jet is due to ram pressure.We constrain the IFM to be between (1-20)×10 -29 gm cm-3. This is consistent with recent direct probes of the IFMand theoretical models. These observations justify future searches for bent double lobe radio sources located several megaparsecs from cluster cores, as they may be good markers of super cluster filaments. © 2010 The American Astronomical Society. All rights reserved.