X-ray weighted metal map of a merging model cluster with galaxy isodensity lines drawn in.
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The sublucster, approaching from the left bottom side, shows higher metallcity behind the direction of motion, then in front of. Metal maps in combination with galaxy densities can help to distinguish whether a cluster is in the pre- or post merger phase. The image has 5 Mpc on a side.
 
Institute for Astrophysics, University of Innsbruck