Spectral and morphological signatures of cluster merger shocks: CIZA J2242.8+5301
Abstract
The CIZA J2242.8+5301 cluster hosts an extraordinary, narrow, Mpc-wide, diffuse patch of radio emission tracing travelling shock waves, called a relic. We perform a multi-wavelength of observations of the cluster. We discover radio spectral steepening and increasing spectral curvature in the shock downstream area, indicative of emission produced by spectrally-aged electrons, following a JP ageing model. The curved integrated spectrum towards 16 GHz challenges the favoured relic formation model. Further, we find a boosting the number density of Hα emitters by a factor of 10, possibly caused by interactions of the galaxies with the shock wave.
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