Suppressed Star Formation by a Merging Cluster System
  We examine the effects of an impending cluster merger on galaxies in the
large scale structure (LSS) RX J0910 at $z =1.105$. Using multi-wavelength
data, including 102 spectral members drawn from the Observations of Redshift
Evolution in Large Scale Environments (ORELSE) survey and precise photometric
redshifts, we calculate star formation rates and map the specific star
formation rate density of the LSS galaxies. These analyses along with an
investigation of the color-magnitude properties of LSS galaxies indicate lower
levels of star formation activity in the region between the merging clusters
relative to the outskirts of the system. We suggest that gravitational tidal
forces due to the potential of the merging halos may be the physical mechanism
responsible for the observed suppression of star formation in galaxies caught
between the merging clusters.
