Superdiffusive shock acceleration at galaxy cluster shocks.
Zimbardo G., Perri S.
III - Astrofisica
Aula 32B-3 - Lunedì 17 h 16:00 - 19:00
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Galaxy cluster merger shocks are the likely source of relativistic electrons, but there is a long-standing discrepancy between the radio derived Mach numbers and the Mach numbers derived from X-ray measurements. Here, we show how superdiffusive electron transport and superdiffusive shock acceleration (SSA) can help to solve this problem. We present the particle energy spectral index obtained from SSA. The resulting expression for the radio spectral index is then used to determine the superdiffusive exponent for several radio relics. Therefore, the Mach number discrepancy can be explained without making assumptions on the energy spectrum of seed electrons to be re-accelerated.