Figure 1 from the paper. Click for original.

Using ground-based radio telescopes, astronomers have now discovered a very strange asymmetrical radio galaxy squashed into a gigantic arc almost two million light years across as the galaxy pushes its way into the surrounding material of an even more gigantic galactic cluster.

In RAD-BAARG [the name they have given the galaxy], the researchers say one of the jets appears to interact with a large bow shock-like structure formed as the host galaxy falls through the surrounding hot gas toward a nearby cluster of galaxies. Similar to the shockwave formed ahead of a supersonic aircraft, a galaxy moving faster than the speed of sound in the surrounding intracluster medium can compress the ambient gas and generate a large-scale shock front.

The radio-emitting plasma from RAD-BAARG appears to illuminate this otherwise extremely faint structure, making it visible in low-frequency radio images, according to the team. The western side of the source contains a narrow jet feeding a sector-shaped emission region and a giant arc-like feature extending over nearly 560 kiloparsecs (1.8 million light years).

On the opposite side, the jet develops a distorted S-shaped morphology followed by a faint offset tail extending to almost 600 kiloparsecs. The overall structure suggests strong interaction between the radio plasma and the surrounding large-scale environment.

You can read their published paper here. The images to the right are figure 1 from that paper. The top image is just the radio data. The bottom image shows the contours of that radio data over the optical view. The cross marks the location of object’s host galaxy, as seen in the optical.