Method Illustration by Lidiia Zadorozhna (IMAGE)

University of Copenhagen

Method Illustration by Lidiia Zadorozhna

Caption

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). Illustration: Lidiia Zadorozhna

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Illustration: Lidiia Zadorozhna

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