https://www.spacescoop.org/en/scoops/2108/a-hidden-map-of-the-invisible-magnetic-universe/

Galaxy clusters are basically made of:

1. Dark matter which can only be detected with light passing near it, and,

2. Hot plasma, a gas so hot that its atoms fly apart!

 

As galaxies in a cluster slam into each other and the surrounding matter, they create bow shocks, causing movement of the plasma around these clusters. This movement interacts with the invisible magnetic fields creating magnetic walls around the galaxies inside the cluster.

 

These walls are very hard to detect, and, until now, astronomers had to wait for something to interact with them so they could make indirect observations of these magnetic walls. As these interactions are really hard to see, understanding these magnetic fields is not easy.

 

But now, with the maps provided by the high-energy jets coming out of black holes, the task can be a little easier. 

 

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