MeerKAT's discovery of a radio relic in the bimodal merging cluster
  A2384
  We present the discovery of a single radio relic located at the edge of the
galaxy cluster A2384, using the MeerKAT radio telescope. A2384 is a nearby ($z$
= 0.092), low mass, complex bimodal, merging galaxy cluster that displays a
dense X-ray filament ($\sim$ 700 kpc in length) between A2384(N) (Northern
cluster) and A2384(S) (Southern cluster). The origin of the radio relic is
puzzling. By using the MeerKAT observation of A2384, we estimate that the
physical size of the radio relic is 824 $\times$ 264 kpc$^{2}$ and that it is a
steep spectrum source. The radio power of the relic is $P_{1.4\mathrm{GHz}}$
$\sim$ (3.87 $\pm$ 0.40) $\times$ 10$^{23}$ W Hz$^{-1}$. This radio relic could
be the result of shock wave propagation during the passage of the low-mass
A2384(S) cluster through the massive A2384(N) cluster, creating a trail
appearing as a hot X-ray filament. In the previous GMRT 325 MHz observation we
detected a peculiar FR I radio galaxy interacting with the hot X-ray filament
of A2384, but the extended radio relic was not detected; it was confused with
the southern lobe of the FR I galaxy. This newly detected radio relic is
elongated and perpendicular to the merger axis, as seen in other relic
clusters. In addition to the relic, we notice a candidate radio ridge in the
hot X-ray filament. The physical size of the radio ridge source is $\sim$ 182
$\times$ 129 kpc$^{2}$. Detection of the diffuse radio sources in the X-ray
filament is a rare phenomenon, and could be a new class of radio source found
between the two merging clusters of A2384(N) and A2384(S).
