CHANCES will provide legacy spectroscopic support for the eROSITA X-ray mission, complementing that from the 4MOST Galaxy Clusters Survey, by obtaining spectroscopic redshifts confirming membership for >1000 galaxies per cluster.
The survey will provide comprehensive spectroscopic coverage of cluster galaxies both within and well beyond the virial radius, covering the surrounding infall regions out to 5r200 from the cluster. This will permit us to map the hierarchical assembly of the clusters in detail, and measure the importance of pre-processing, where galaxies are transformed within X-ray groups and filaments prior to their arrival into the clusters themselves.
