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

Stroe, Andra and van Weeren, Reinout J. and Sobral, David and Rumsey, Clare and Intema, Huib T. and Röttgering, Huub J. A. and Harwood, Jeremy J. and Saunders, Richard and Brüggen, Marcus and Hoeft, Matthias (2014) Spectral and morphological signatures of cluster merger shocks:CIZA J2242.8+5301. arXiv. p. 4.

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

Item Type:
Journal Article
Journal or Publication Title:
arXiv
ID Code:
77625
Deposited By:
Deposited On:
15 Jan 2016 12:02
Refereed?:
No
Published?:
Published
Last Modified:
11 Jul 2020 05:37