An Off-Axis Galaxy Cluster Merger: Abell 0141
  We present structural analysis results of Abell 0141 ($z$ = 0.23) based on
X-ray data. The X-ray luminosity map demonstrates that Abell 0141 (A0141) is a
bimodal galaxy cluster, which is separated on the sky by $\sim$ 0.65 Mpc with
an elongation along the north-south direction. The optical galaxy density map
also demonstrates this bimodality. We estimate sub-cluster ICM temperatures of
5.17$^{+0.20}_{-0.19}$ keV for A0141N and 5.23$^{+0.24}_{-0.23}$ keV for
A0141S. We obtain X-ray morphological parameters w = 0.034$\pm{0.004}$, c =
0.113$\pm{0.004}$ and w = 0.039$\pm{0.004}$, c = 0.104$\pm{0.005}$ for A0141N
and A0141S, respectively. The resulting X-ray morphological parameters indicate
that both sub-clusters are moderately disturbed non-cool core structures. We
find a slight brightness jump in the bridge region, and yet, there is still an
absence of strong X-ray emitting gas between sub-clusters. We discover a
significantly hotspot ($\sim$ 10 keV) between sub-clusters, and a Mach number
$\textit{M}$ = 1.69$^{+0.40}_{-0.37}$ is obtained by using the temperature jump
condition. However, we did not find direct evidence for shock-heating between
sub-clusters. We estimate the sub-clusters' central entropies as $K_{0}$ > 100
keV cm$^{2}$, which indicates that the sub-clusters are not cool cores. We find
some evidence that the system undergoes an off-axis collision; however, the
cores of each sub-clusters have not yet been destroyed. Due to the orientation
of X-ray tails of sub-clusters, we suggest that the northern sub-cluster moves
through the south-west direction, and the southern cluster moves through the
north-east direction. In conclusion, we are witnessing an earlier phase of
close core passage between sub-clusters.
