Distribution of H-alpha Emitters in Merging Galaxy Clusters

Studies of star formation in various galaxy cluster mergers have reached apparently contradictory conclusions regarding whether mergers stimulate star formation, quench it, or have no effect. Because the mergers studied span a range of time since pericenter (TSP), it is possible that the apparent effect on star formation is a function of TSP. We use a sample of 12 bimodal mergers to assess the star formation as a function of TSP. We measure the equivalent width of the H-alpha emission line in ${\sim}100$ member galaxies in each merger, classify galaxies as emitters or non-emitters, and then classify emitters as star-forming galaxies (SFG) or active galactic nucleus (AGN) based on the [NII] $\lambda6583$ line. We quantify the distribution of SFG and AGN relative to non-emitters along the spatial axis defined by the subcluster separation. The SFG and AGN fractions vary from merger to merger, but show no trend with TSP. The spatial distribution of SFG is consistent with that of non-emitters in eight mergers, but show significant avoidance of the system center in the remaining four mergers, including the three with the lowest TSP. If there is a connection between star formation activity and TSP, probing it further will require more precise TSP estimates and more mergers with TSP in the range of 0-400 Myr.
Comment: accepted to AJ