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Spectral and morphological signatures of cluster merger shocks: CIZA J2242.8+5301

Research output: Contribution to Journal/MagazineJournal article

  • Andra Stroe
  • Reinout J. van Weeren
  • David Sobral
  • Clare Rumsey
  • Huib T. Intema
  • Huub J. A. Röttgering
  • Jeremy J. Harwood
  • Richard Saunders
  • Marcus Brüggen
  • Matthias Hoeft
<mark>Journal publication date</mark>29/04/2014
Number of pages1
Pages (from-to)4
Publication StatusPublished
<mark>Original language</mark>English


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 H$\alpha$ emitters by a factor of $10$, possibly caused by interactions of the galaxies with the shock wave.