A Pre-Merger Stage Galaxy Cluster: Abell 3733
  The galaxy cluster Abell 3733 (A3733) is a very suitable candidate in
addressing dynamical processes throughout galaxy cluster mergers. This study
shows structural analysis results of A3733 (z = 0.038) based on X-ray and
optical data. According to X-ray luminosity map, A3733 hosts two sub-structures
separated in the sky by $\sim$ 0.25 Mpc, and the two distinct clumps are
located in the East (A3733E) and the West (A3733W) directions. Both
sub-structures are centred on two different brightest cluster galaxies (BCGs),
and the X-ray and optical centroids of both BCGs substantially coincide with
each other. The intracluster medium (ICM) temperatures of the sub-structures
are estimated to be 2.79 keV for A3733E and 3.28 keV for A3733W. Both
sub-structures are found to be hosting cool central gas (kT $ \sim $ 1.5-2.5
keV) surrounded by hotter gas (kT $\sim $ 3.0-3.5 keV). Besides, the X-ray
concentration parameters are found to be c $\sim $ 0.3 for each sub-structure.
These results indicate the existence of cool centres for both sub-structures.
The optical density map reveals a crowded galaxy population within the vicinity
of A3733W. The high probable (% 88.2) dynamical binding model of A3733 suggests
that the cores of sub-structures have a 3D separation of 0.27 Mpc and will
collide in 0.14 Gyr with the relative in-falling velocity of 1936 km s$^{-1}$.
As a conclusion, this study demonstrates some evidence suggesting that the
A3733 system is in the pre-merger state.
