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The most extreme cluster mergers can lead to massive cluster-wide travellingshock waves. The CIZA J2242.8+5301 ('sausage') and 1RXS J0603.3+4213(`toothbrush') clusters ($z\sim0.2$) host enormous radio-emitting shocks withsimple geometry. We investigate the role of mergers and shocks in shaping theH$\alpha$ luminosity function, using custom-made narrow-band filters matchingthe cluster redshifts mounted on the INT. We surveyed $\sim0.28$ deg$^2$ foreach cluster and found $181$ line emitters in the `sausage' (volume of$3.371\times10^3$ Mpc$^3$ for H$\alpha$ at $z=0.1945$) and $141$ in the`toothbrush' ($4.546\times10^3$ Mpc$^3$ for H$\alpha$ at $z=0.225$), out ofwhich $49$ (`sausage') and $30$ (`toothbrush') are expected to be H$\alpha$. Webuild luminosity functions for the field-of-view down to an average limitingstar formation rate of $0.14$ M$_{\odot}$ yr$^{-1}$, find good agreement withfield luminosity functions at $z=0.2$, but significant differences between theshapes of the luminosity functions for the two clusters. We discover extended,tens-of-kpc-wide H$\alpha$ haloes in galaxies neighbouring relics, which werepossibly disrupted by the passage of the shock wave. By comparing the `sausage'cluster with blank fields and other clusters, we also uncover an order ofmagnitude boost (at $9\sigma$ level) in the normalisation $\phi^*$ of theluminosity function in the relic areas. Our results suggest that clustermergers may play an important role in the evolution of cluster galaxies throughshock-induced star formation.

monthly notices of the royal astronomical society

The role of cluster mergers and travelling shocks in shaping the  H$\alpha$ luminosity function at $\bf z\sim0.2$: `sausage' and `toothbrush'  clusters