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

TL;DR

This paper reports the discovery of a bent double lobe radio source in a cluster filament, providing new constraints on the intra-filament medium's density and demonstrating its potential as a marker for supercluster filaments.

Contribution

It presents the first detection of a bent double lobe radio source in a known cluster filament and derives constraints on the intra-filament medium's density.

Findings

The bent DLRS is located 3.4 Mpc from Abell 1763.

The intra-filament medium density is constrained between 1 and 20 x 10^-29 g/cm^3.

The source's bend angle is 25 degrees, viewed at 10 degrees.

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 3.4 Mpc from the center of the rich galaxy cluster, Abell~1763. We derive a bend angle alpha=25deg, and infer that the source is most likely seen at a viewing angle of Phi=10deg. From measuring 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)x10^-13 dyn/cm^2, and derive constraints on the intra-filament medium (IFM) assuming the bend of the jet is due to ram pressure. We constrain the IFM to be between (1-20)x10^-29 gm/cm^3. This is consistent with recent direct probes of the IFM and theoretical models. These observations justify future searches for bent double lobe radio sources located several Mpc from cluster cores, as they may be good markers of super cluster filaments.