2022
DOI: 10.48550/arxiv.2210.16817
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Cosmic Ray Acceleration and Nonthermal Radiation at Accretion Shocks in the Outer Regions of Galaxy Clusters

Abstract: Cosmology models predict that external accretion shocks form in the outer region of galaxy clusters due to supersonic gas infall from filaments and voids in the cosmic web. They are characterized by high sonic and Alfvénic Mach numbers, M s ∼ 10 − 10 2 and M A ∼ 10 2 − 10 3 , and propagate into weakly magnetized plasmas of β ≡ P g /P B 10 2 . Although strong accretion shocks are expected to be efficient accelerators of cosmic rays (CRs), nonthermal signatures of shock-accelerated CRs around clusters have not b… Show more

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