University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, November 16th 2015
12:45 pm:
Speaker: Julius Donnert, University of Minnesota
Subject: Magnetic Field Amplification in the Sausage Relic

Radio relics are believed to trace Mpc-scale shocks in the outskirts of massive galaxy clusters. They are likely sites of particle acceleration, where cosmic-ray electrons gain energy in the shock and become synchrotron bright in the magnetic field of the intra-cluster medium. Many models for radio relics require substantially larger magnetic fields than motivated from our general understanding of fields and their amplification in the outskirts of cluster. We present a new detailed model of the prototype of radio relics, the Sausage relic in CIZA J2242.8+5301, aimed to reproduce the recently observed spectral steepening in the relic. We also provide limits on the acceleration efficiency
required to model the relic, which puts tension on direct shock acceleration from the thermal pool.

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