Finally, astronomers “can confirm what so far has only been predicted by simulations — that these shock waves exist.”
Finally, astronomers “can confirm what so far has only been predicted by simulations — that these shock waves exist,” says astrophysicist Marcus Brüggen of the University of Hamburg in Germany, who was not involved in the new study.
Instead of looking for individual shock waves, Vernstrom and her colleagues combined radio images of more than 600,000 pairs of galaxy clusters close enough to be connected by filaments to create a single “stacked” image. This amplified weak signals and revealed that, on average, there is a faint radio glow from the filaments between clusters.
In this computer simulation, gas falling onto the cosmic web heats and expands, setting off shockwaves that ripple through the hot, expanded gas and throughout the vast network of galaxy clusters and filaments that fills our universe. These shockwaves interact with magnetic fields in the cosmic web to create radio signals that astronomers can observe.
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