How Galaxy Clusters Could Reveal the Secrets of Dark Matter
Sandeep K S
Aug 16, 2025
1 min read
Updated: Nov 2, 2025
Black hole galaxies emit energy and light, including gamma rays (γ) (left panel). If axions exist, some of the γ-rays would, hypothetically, turn into axions (a) as they travel through the magnetic fields surrounding clusters of galaxies. But since these magnetic fields are very intricate, it is impossible to predict such a conversion to axions in a single observation, resulting in messy data (center panel). But by combining knowledge from many of these galactic pairs, the step-like signature appears (right panel). Credit: Lidiia Zadorozhna
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