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Mechanism of particle re-acceleration along the IC 310 trail

Determine the precise particle re-acceleration mechanism responsible for maintaining the roughly constant surface brightness along the 700 kpc radio trail behind the tailed radio galaxy IC 310, evaluating stochastic Fermi II turbulence versus alternative processes.

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Background

The IC 310 radio trail shows an approximately constant brightness over 700 kpc, suggesting ongoing re-acceleration that balances radiative losses. The authors state that the exact mechanism remains unclear and mention stochastic Fermi II re-acceleration as a possibility.

References

The precise nature of the re-acceleration mechanism is unclear, but this would be an inefficient process for explaining the observed radio properties (e.g., stochastic Fermi II re-acceleration by turbulence).

— LOFAR high-band antenna observations of the Perseus cluster (2410.02863 - Weeren et al., 3 Oct 2024) in Section 4.3 (Halo–tail connection)