Star Formation Enhancement in Barred Disk Galaxies in Interacting Galaxy
  Clusters
  A recent study shows that bars can be induced via interaction of galaxy
clusters, but it has been unclear if the bar formation by the interaction
between clusters is related to the enhancement of star formation. We study
galaxies in 105 galaxy clusters at $0.015<z<0.060$ detected from Sloan Digital
Sky Survey data, in order to examine whether the fraction of star-forming
galaxies ($f_\mathrm{sf}$) in 16 interacting clusters is enhanced compared with
that of the other non-interacting clusters and to investigate the possible
connection between the $f_\mathrm{sf}$ enhancement and the bar formation in
interacting clusters. We find that $f_\mathrm{sf}$ is moderately higher
($\sim20\%$) in interacting clusters than in non-interacting clusters and that
the enhancement of star formation in interacting clusters occurs only in
moderate-mass disk-dominated galaxies ($10^{10.0} \le M_\mathrm{star}/M_{\odot}
< 10^{10.4}$ and the bulge-to-total light ratio is $\le0.5$). We also find that
the enhancement of $f_\mathrm{sf}$ in moderate-mass disk-dominated galaxies in
interacting clusters is mostly due to the increase of the number of barred
galaxies. Our result suggests that the cluster-cluster interaction can
simultaneously induce bars and star formation in disk galaxies.
