Spectral and morphological signatures of cluster merger shocks: CIZA J2242.8+5301
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 shoc...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Subjects: | |
| Online Access: | https://astron-soc.in/bulletin/asics_vol013/ http://hdl.handle.net/20.500.11937/76025 |
| Summary: | 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. |
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